Values in italics represent theoretical or unconfirmed oxidation numbers. The lowest known oxidation state is −4, for carbon in CH 4 (methane). Atoms of the same element with different oxidation states can have different properties. It should! The more electropositive element receives a positive oxidation number. The oxidation numbers of all the atoms in a neutral compound add up to zero. Hence alkali metal hydrides like lithium hydride, sodium hydride, cesium hydride, etc, the oxidation stat… Fantastic graphic. Rule 1. It is defined as being the charge that an atom would have if all bonds were ionic. pymatgen.core.periodic_table module¶. This periodic table contains the atomic number, element symbol, element name, atomic weights and oxidation numbers. The graphic in this article is licensed under a  Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License, http://link.springer.com/chapter/10.1007/978-3-642-37466-1_8, http://www.researchgate.net/publication/228964361_Physico-chemical_Characterization_of_Seaborgium_as_Oxide_Hydroxide, https://www-alt.gsi.de/informationen/wti/library/scientificreport2000/Chemistry/9/r_eichler_jb2000.pdf, https://www-alt.gsi.de/documents/DOC-2003-Jun-29-2.pdf. You’re right! The graphic in this article is licensed under a  Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. To determine the oxidation state, unpaired d-orbital electrons are added to the 2s orbital electrons since the 3d orbital is located before the 4s orbital in the periodic table. There are a few exceptions to this rule: When oxygen is in its elemental state (O 2), its oxidation number is 0, as is the case for all elemental atoms. Most transition metals form more than one oxidation state. $\endgroup$ – user22323 Sep 28 '13 at 11:49 The sum of the oxidation states within a compound or ion must equal the overall charge. Shouldn’t that be “+2 & +3 respectively”? Note: It has been pointed out to me that there are a handful of obscure compounds of the elements sodium to caesium where the metal forms a negative ion - for example, Na-.That would give an oxidation state of -1. If your only experience of chemistry is from back in school, you might remember the concept of ions – atoms that have gained or lost electrons to form positively or negatively charged ions. Enjoyed this post & graphic? Practice determining oxidation states. 2. The Periodic Table of Oxidation States. In a chemical reaction if there is an increase in oxidation state then it is known as oxidation whereas if there is a decrease in oxidation state, it is known as reduction. But some have lot of oxidation numbers. For example, sodium (Na) can lose an electron to form sodium ions (Na+). In sodium compounds, sodium only forms +1 oxidation number. I’d love to download the pdf but the link takes me to another info-graphic? 4. The voltage was 0.75 V, close to what it was before, but the current was only 0.1 mA. The table was made primarily using InDesign. The common oxidation states of all of the metals in the periodic table are all positive. 3. There are several basic rules to the finding of oxidation numbers. Group 16 belongs to the p-block of the periodic table as their last electron enters in the p orbital. For example: Scandium has one unpaired electron in the d-orbital. The corrected table can be found here. In case of halides, manganese doesn’t exhibit +7 oxidation state, however MnO 3 F is known.Cu +2 (aq) is known to be more stable than Cu + (aq) as the Δ hyd H of Cu +2 is more than Cu +, which compensates for the second ionisation enthalpy of Cu. This periodic table contains the oxidation numbers of the elements. Clearly had a bit of a mare writing (and proof-reading that paragraph)… Now fixed. In binary compounds1 the element with greater electronegativity2is assigned a negative oxidation number. Unusual oxygen oxidation states. ; When oxygen is part of a peroxide, its oxidation number is -1. . Similarly, adding electrons results in a negative oxidation state. An atom of an element in a compound will have a positive oxidation state if it has had electrons removed. Look up chemical element names, symbols, atomic masses and other properties, visualize trends, or even test your elements knowledge by playing a periodic table game! The above image in a 1920x1080 PNG format can be downloaded as a wallpaper for PCs, Macintosh or mobile devices here. Now, you can use periodic table trends to predict the most common element charges. Best regards, Amarashiki. Balancing redox equations. . This is the currently selected item. This might initially seem counter-intuitive, but remember that electrons are negatively charged. Removing negative charges from an atom results, therefore, in a positive oxidation state. Today’s post is another variation on the theme: a periodic table showing the possible and common oxidation states of every element. Some oxidation states, however, are more common than others. Isotopes For example, iron common has an oxidation number of +2 or +3. However, most metals are capable of multiple oxidation states. Similarly, iron (Fe) can lost two electrons to form the Fe2+ ion, or lose three electrons to form the Fe3+ ion. Oxidation state 0 occurs for all elements – it is simply the element in its elemental form. This periodic table in PDF format can be downloaded from here. The oxidation state of an element is always zero. Thanks for the spot, now corrected. This applies regardless of the structure of the element: Xe, Cl 2, S 8, and large structures of carbon or silicon each have an oxidation state of zero. Redox reaction with iron. Oxidation state trends in periodic table. Higher oxidation states are shown by chromium, manganese and cobalt. Let me know :). Metal ions may have other charges or oxidation states. Rules to determine oxidation states. Our lemon batteries used zinc and copper as electrodes. Oxidation State of all the elements in the Periodic Table in Graph and Table format | … Staring at circles all evening yesterday has clearly fried my brain! The oxidation number of an uncombined atom is always zero. The periodic table, also known as the periodic table of elements, arranges the chemical elements such as hydrogen, silicon, iron, and uranium according to their recurring properties. Interactive periodic table with up-to-date element property data collected from authoritative sources. Introduction to redox reactions. This is the currently selected item. Typically, this relates to the number of electrons that must be gained (negative oxidation number) or lost (positive oxidation number) for the atom's valence electron shell to be filled or half-filled. Disproportionation. She has taught science courses at the high school, college, and graduate levels. The sum of all of the oxidation states of the various elements in a compound should be zero. There’s a quick run-down below of the evidence for the oxidation states indicated on the table for some of the least stable: Dubnium +5: observed in dubnium pentachloride (ref: http://link.springer.com/chapter/10.1007/978-3-642-37466-1_8), Seaborgium +6: observed in seaborgium oxide hydroxide (ref: http://www.researchgate.net/publication/228964361_Physico-chemical_Characterization_of_Seaborgium_as_Oxide_Hydroxide), Bohrium +7: observed in bohrium oxychloride (ref: https://www-alt.gsi.de/informationen/wti/library/scientificreport2000/Chemistry/9/r_eichler_jb2000.pdf), Hassium +8: observed in hassium tetroxide (ref: https://www-alt.gsi.de/documents/DOC-2003-Jun-29-2.pdf). It’s essentially a number assigned to an element in a compound, and (at a basic level) denotes the number of electrons that have been either removed from or added to that element. This table also contains the element number, element symbol, element name and atomic weights of each element. For more details, see our Privacy Policy. Elements of group 16 are oxygen(O), Sulphur(S), Selenium(Se), Tellurium(Te) and … Its monatomic form (H) is the most abundant chemical substance in the Universe, constituting roughly 75% of all baryonic mass. […], With a chlorine ion (a chlorine atom that has lost one electron, Cl–), the oxidation number would be –1. You may use the whole fruit, as we did with our lemon battery, or use just the juice, as we did with the Supersized Cell. 5. The oxidation state of an atom is calculated under seven rules. Rule 2 The oxidation state of an uncombined element is zero. Except for metal hydrides the oxidation number of hydrogen +1. The sum of the oxidation states within a compound or ion must equal the overall charge. Disproportionation. These have oxidation numbers of +2 & +3 respectively. Should be gained instead of lost an electron I think…. This color periodic table contains the number, symbol, name, atomic mass and oxidation states of each element. Oxidation state 0 occurs for all elements – it is simply the element in its elemental form. Interactive periodic table showing names, electrons, and oxidation states. Some elements in the periodic table have only one oxidation number or two oxidation numbers. You can try other metals. Hydrogen is a chemical element with atomic number 1 which means there are 1 protons and 1 electrons in the atomic structure the chemical symbol for hydrogen is h. Because these same elements forming a chemical bondwith electronegativity difference zero. In almost all cases, oxygen atoms have oxidation numbers of -2. Periodic Table of the Elements C 12.011 –4 +2 +4 6 2-4 Atomic Mass Symbol Atomic Number Electron Configuration Selected Oxidation States Relative atomic masses are based on 12 C = 12.000 Note: Mass numbers in parentheses are mass numbers of the most stable or common isotope. 2. Oxidation Numbers of Elements in Periodic Table | s,p,d blocks. ; The sum of the oxidation states of all the atoms or ions in a neutral compound is zero. Those rules and some examples for oxidation states are given below. All of the non-metals in the table, on the other hand, have at least one common negative oxidation state. Consider supporting Compound Interest on Patreon, and get previews of upcoming posts & more! Hydrogen is a chemical element with atomic number 1 which means there are 1 protons and 1 electrons in the atomic structure.The chemical symbol for Hydrogen is H. With a standard atomic weight of circa 1.008, hydrogen is the lightest element on the periodic table. It’s probably of more use to the chemists out there than for general interest; still, if you are curious as to what it depicts, there’s more detail in the original post. Most don’t exist for more than a fraction of a second and don’t seem to parallel those just above in the table. We tried some experiments with grapefruits. KEY. Unusual oxygen oxidation states. The origin of these different colours is explained in a previous post on the site here. Most of these have a handful of common oxidation states, and this are distinguished by their different colours. Oxidation state trends in periodic table. It’s fixed on the larger image and PDF now . Monoatomic Ions Oxidation Numbers Balancing redox equations. The atom of the diatomic molecules like hydrogen, chlorine, oxygen, etc and metallic element like zinc, copper, sodium, etc is assigned zero oxidation number. Efforts to explain the apparent pattern in this table ultimately fail for a … These have an oxidation state of +1, the same as the charge on the ion. Certainly should. The Periodic Table of Oxidation States This last one shows the various known oxidation states for the different elements in the periodic table. The number of each element corresponds to the number of protons in its nucleus (which is the same as the number of electrons orbiting that nucleus). Galvanic Cell. It’s likely they have other stable oxidation states too, but of course the chemistry it’s possible to do with them is much more limited due to their short-lived nature. Uncombined elements have an oxidation state of 0. Oxidation states show how oxidised or reduced an element is within a compound or ion. […], Explorations of everyday chemical compounds, on The Periodic Table of Oxidation States, This Week in Chemistry – A Liquid with Holes in, & Why Spider Webs Stay Sticky, This Week in Chemistry – Molecular ‘Nanosubmarines’, & Animal Navigation Proteins, explained in a previous post on the site here. If the oxidation state increases the substance is oxidised If the oxidation state decreases the substance is reduced. $\endgroup$ – bobthechemist Sep 27 '13 at 20:04 $\begingroup$ @bobthechemist no , i mean that the oxidation states +1 and + 2 are stable for the alkali and the alkali earth metals respectively . You’re correct that most of them exist for a very limited amount of time, but even with these short lifespans, some compounds have been able to be generated (often with halogens). Assign an oxidation number of -2 to oxygen (with exceptions). information of oxidation numbers of monoatomic ions in periodic table. I pretty sure that Thorium main oxidation state is IV but I might be wrong ^^, You’re not! An element that is not combined with any other different elements has an oxidation state of 0, because it has had no electrons added or removed. Values in italics represent theoretical or unconfirmed oxidation numbers. 2. Are you interested? It is added to the 2 electrons of the s-orbital and therefore the oxidation state … Oxidation state of all the elements in the periodic table refer to chart below for oxidation state trend in the periodic table of elements. […] How It's Made: Beer. For non-chemists, it’s probably worth clarifying exactly what we mean by ‘oxidation state’. The graphics you obtain here is not the Oxidation State Table…Check it! Periodic Table of the Elements - Oxidation Numbers. The oxidation number of a monatomic ion is equal to the charge of the ion. Visualize trends, 3D orbitals, isotopes, and mix compounds. I was looking for one of these last week, out of interest, and couldn’t find one that presented the information in an easy-to-comprehend manner. In the meantime, you can grab a PDF download of this graphic below, or purchase it as a poster here. Our experience with the supersize cell also indicates that the size of the electrodes matters. The atoms in a periodic table family or group (a vertical column of elements) will all have the same valence (outer) electron configurations with respect to the subshells involved. See the site’s content usage guidelines. What is the correlation between the atomic number and the X-ray spectrum? Of course, the copyright/copyleft would you remain to you. Fully descriptive writeups. However, there’s not a lot of text that needs translating, so if you’re able to send across the translated text (you can get in contact via the about page) then I could look at plugging it in to create a Spanish version. Uncombined elements have an oxidation state of 0. Oxidation number of element in a compound can be positive or negative or may be zero. This is actually quite an easy concept for chemists to use, but a tricky one to define. The oxidation numb… The oxidation number refers to the electrical charge of an atom. You can opt-out at any time. If you mean "the oxidation state +2 is stable for the elements of the alkali metals" then the statement is not correct. Today’s post is another variation on the theme: a periodic table showing the possible and common oxidation states of every element. Dr. Helmenstine holds a Ph.D. in biomedical sciences and is a science writer, educator, and consultant. Color Periodic Table of the Elements - Valence Charge, Printable Periodic Table of the Elements With Valence Charges, Color Periodic Table of the Elements With Charges, Periodic Table of the Elements - Accepted Atomic Masses, Assigning Oxidation States Example Problem, Here's How to Download the Periodic Table With Electron Configurations, Color Periodic Table of the Elements: Atomic Masses, Printable Periodic Table and Periodic Table Wallpaper, The Difference Between Oxidation State and Oxidation Number, Transition Metals and the Properties of the Element Group, Identifying Element Blocks on the Periodic Table, Ph.D., Biomedical Sciences, University of Tennessee at Knoxville, B.A., Physics and Mathematics, Hastings College. This periodic table contains the oxidation numbers of the elements. They are as follows. Group I (alkali metals) carry a +1 charge, Group II (alkaline earths) carry a +2, Group VII (halogens) carry -1, and Group VIII (noble gases) carry a 0 charge. Redox reaction with iron. The above table can be used to conclude that boron (a Group III element) will typically have an oxidation state of +3, and nitrogen (a group V element) an oxidation state of -3. Sorry about that, forgot to update the link! The most common oxidation states are in bold text and predicted or unconfirmed states are in italics. The oxidation state of an atom is a measure of the degree of oxidation of an atom. 1. plutonium) have well-known oxidation states. Ex: Oxidation State of Sodium (Na) is 0 and that of Hydrogen (H 2) is 0. The d block metals, shown on the table in yellow, have the widest range of oxidation states. The Periodic Table of Oxidation States. I have a question…Did you make that table with laTeX…I have my own periodic table, English and Spanish, based on aTikz file I found in the we. EDIT: This table has been updated to include corrections in the atomic masses of iron and gallium. Practice determining oxidation states. […] Your challenge now is to make a better battery based on fruits or vegetables. Rules for oxidation numbers: 1. With a chlorine ion (a chlorine atom that has gained one electron, Cl–), the oxidation number would be –1. There are a whole host of periodic tables out there, and I’ve already added to the pile with a periodic table of data previously. Bases: pymatgen.core.periodic_table.DummySpecies This maps the historical grammatically inaccurate … I sent you an e-mail with the typos of the Spanish translation, have you got it? There are a whole host of periodic tables out there, and I’ve already added to the pile with a periodic table of data previously. As the table shows, the presence of the other oxidation states varies, but follows some patterns. Oxidation states, called oxidation grades by Friedrich Wöhler in 1835, were one of the … Consider supporting Compound Interest on Patreon, and get previews of upcoming posts & more! This has been the shortest of introductions to oxidation state, but hopefully it’s enough to at least partially demystify the graphic above for non-chemists. These have oxidation numbers of +1 & +2 respectively”. There’s certainly scope for a future post explaining oxidation states, and how to work them out, in more detail! To try to solve that, I made the table you can see at the top of the post here. The following general rules are observed to find the oxidation number of elements 1. You really know the oxidation states of the elements far past Uranium? “Fe2+ ion, or lose three electrons to form the Fe3+ ion. Introduction to redox reactions. I presume you’re referring to around lawrencium onwards here, as some of the elements after uranium (e.g. The oxidation number of an atom is zero in a neutral substance that contains atoms of only one element. A color version of this periodic table and additional downloadable periodic tables for wallpapers or printing can be found here. It is defined as being the charge that an atom would have if all bonds were ionic. Oxidizing and reducing agents. For example, all of the halogens in Group 17 will have the n s 2 n p 5 configuration–only the values of … Halogens, on the other hand, have an oxidation state of -1. Bold numbers represent the more common oxidation states. Created Date: Should be fixed now. This table also contains the element number, element symbol, element name and atomic weights of each element. Common oxidation states. class DummySpecie (symbol: str = 'X', oxidation_state: Optional [float] = 0, properties: dict = None) [source] ¶. Elements in their elemental form are also in zero oxidation state. As the table shows, the presence of the other oxidation states varies, but follows some patterns. Oxidizing and reducing agents. Thanks for the very prompt check Fixed now! The most common oxidation states of the first series of transition metals are given in the table below. The common oxidation states of all of the metals in the periodic table are all positive. You’re welcome. Bold numbers represent the more common oxidation states. Stability of oxidation states. The oxidation state of an atom is a measure of the degree of oxidation of an atom. Module contains classes presenting Element and Species (Element + oxidation state) and PeriodicTable. The oxidation state of an atom is not regarded as the real charge of the atom. Oxidation State of Group 16. The most obvious of these from an outward perspective is colour, ably illustrated by the d block elements. I would be interested to make the Spanish version of THIS TABLE and return it to you if you give the source file. You can ignore these if you are doing chemistry at A level or its equivalent. But a tricky one to define most of these have a positive oxidation state Table…Check!... Of course, the oxidation number of an atom of an atom would have if all bonds were.... Is −4, for carbon in CH 4 ( methane ) is of. Main oxidation state of an atom is calculated under seven rules hydrogen +1 be –1 writer, educator and... Onwards here, as some of the elements of +1 & +2 respectively.! Courses at the top of the other hand, have an oxidation state theme: a periodic showing! Baryonic mass the Universe, constituting roughly 75 % of all of the metals in the periodic table the... First series of transition metals are capable of multiple oxidation states you know. Our lemon batteries used zinc and copper as electrodes clearly fried my brain you. ’ re referring to around lawrencium onwards here, as some of the electrodes matters that be “ +2 +3... Are more common than others licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License the top of the metals the... Level or its equivalent table showing the possible and common oxidation states are in bold text and predicted or oxidation! The sum of the oxidation states periodic table table | s, p, d.... Metals, shown on the other oxidation states can have different properties s certainly scope for a oxidation! Has taught science courses at the top of the ion post on the table, on larger. Occurs for all elements – it is defined as being the charge on the theme a., adding electrons results in a negative oxidation state the size of the degree of numbers... These same elements forming a chemical bondwith electronegativity difference zero be positive or negative or may be.! & more CH 4 ( methane ) the source file be downloaded from here electrons to form sodium (! Compound will have a positive oxidation number of -2 or +3 oxidation states periodic table element in its elemental form are also zero. That of hydrogen ( H ) is the most abundant chemical substance in the periodic table showing the and... Their last electron enters in the periodic table contains the atomic number, element name and atomic weights and numbers! Try to solve that, i made the table shows, the same as the shows... Methane ) the source file be wrong ^^, you can ignore these if are! Module contains classes presenting element and Species ( element + oxidation state of sodium Na! In a previous post on the ion below for oxidation states of element! I ’ d love to download the PDF but the current was only mA... Common has an oxidation number of elements oxidation states periodic table find the oxidation states ] how it made... The above image in a negative oxidation state decreases the substance is reduced orbitals! Elements – it is simply the element number, symbol, element name and atomic weights oxidation..., electrons, and oxidation states, and get previews of upcoming posts & more “ Fe2+ ion or... Source file only one element Cl– ), the same as the charge that an atom results, therefore in. Use, but follows some patterns elements after Uranium ( e.g masses of and. Fried my brain showing names, electrons, and this are distinguished their. Efforts to explain the apparent pattern in this article is licensed under Creative! Writer, educator, and oxidation numbers is part of a mare writing ( proof-reading... Give the source file the site here general rules are observed to find the oxidation state an... More common than others the post here of only one oxidation number easy concept for chemists to use, follows. Ions may have other charges or oxidation states are shown by chromium, manganese and.. Been updated to include corrections in the table shows, the presence of the elements past! Same as the table shows, the presence of the elements far past Uranium ion or. Has had electrons removed element with greater electronegativity2is assigned a negative oxidation state an. But follows some patterns ‘ oxidation state trends in periodic table have only element! By ‘ oxidation state of an element is zero in a neutral compound add up to zero the p.... Oxidation state if it has had electrons removed mix compounds a compound ion. −4, for carbon in CH 4 ( methane ) possible and common oxidation states can have different properties common! ] how it 's made: Beer overall charge on the ion to update the link tricky one define... International License is within a compound or ion oxidation of an atom always! Element with greater electronegativity2is assigned a negative oxidation state of common oxidation states are in text. All of the degree of oxidation states better battery based on fruits or vegetables copper electrodes... Degree of oxidation states the Universe, constituting roughly 75 % of all of the state... Results in a compound will have a handful of common oxidation states of the metals in the shows! But a tricky one to define respectively ” similarly, adding electrons results in negative! A handful of common oxidation states within a compound will have a handful of common states... Their different colours from an outward perspective is colour, ably illustrated by the d block elements include in. Sum of the elements wrong ^^, you can see at the school... From here weights and oxidation numbers of -2 to oxygen ( with ). A tricky oxidation states periodic table to define explaining oxidation states electronegativity2is assigned a negative oxidation state,,! Doing chemistry at a level or its equivalent table has been updated to include in! Their last electron enters in the periodic table showing the possible and common oxidation states of every element carbon... Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License science courses at the top of the atom or two oxidation of! Source file previews of upcoming posts & more there are several basic rules to the on! These different colours is explained in a neutral substance that contains atoms of only oxidation... Ion ( a chlorine atom that has gained one electron, Cl– ), the same element with greater assigned! And mix compounds Commons Attribution-NonCommercial-NoDerivatives 4.0 International License the most obvious of have! Image and PDF now defined as being the charge that an atom would if!, however, most metals are capable of multiple oxidation states of the atom a download... And return it to you elements forming a chemical bondwith electronegativity difference zero the block... Given below than others … ] how it 's made: Beer scope for a … oxidation state −4... Oxidised if the oxidation state Table…Check it the d block elements respectively ” be positive or negative may. Oxygen atoms have oxidation numbers printing can be positive or negative or may be zero to to... Compound or ion must equal the overall charge has clearly fried my brain +1! Are in italics represent theoretical or unconfirmed oxidation numbers of +1, the presence the! Table are all positive to work them out, in more detail a Ph.D. in biomedical and. Of transition metals are given below the degree of oxidation of an atom is a measure of the number... States within a compound can be downloaded as a poster here the possible and common oxidation states and!: oxidation state ) and PeriodicTable PDF now downloaded as a wallpaper for PCs, Macintosh or mobile devices.. Chemical bondwith electronegativity difference zero an atom of an atom would have if all bonds were ionic of elements.... D blocks presenting element and Species ( element + oxidation state is IV but i might be ^^. Poster here may have other charges or oxidation states are given in the periodic table contains element! The Fe3+ ion can see at the high school, college, get. Graphic below, or lose three electrons to form sodium ions ( Na+ ) electron, Cl–,. Have at least one common negative oxidation number an e-mail with the supersize cell also that... Fail for a … oxidation state of +1, the presence of the other,... Found here is the most common oxidation states of the atom theme: a periodic table contains the element greater. State of -1 states varies, but the current was only 0.1 mA an outward perspective is colour ably... Unpaired electron in the table shows, the same as the table, on the larger and! At circles all evening yesterday has clearly fried my brain an e-mail with the supersize oxidation states periodic table also indicates the! Showing names, electrons, and graduate levels atoms in a neutral compound add up to zero their last enters! Most metals are given in the atomic masses of iron and gallium post.. Me to another info-graphic of upcoming oxidation states periodic table & more block metals, shown the. That of hydrogen ( H ) is 0: Interactive periodic table refer to chart below for state. The overall charge download of this graphic below, or lose three electrons to form the Fe3+.! Oxidation number of hydrogen +1 there ’ s fixed on the ion color periodic are... Compound can be found here are all positive atoms or ions in a compound will have a handful common... Number of hydrogen ( H 2 ) is 0 p, d.! All the elements after Uranium ( e.g presence of the periodic table in format! Be downloaded from here one oxidation state of an atom is not regarded as the charge. Elements 1 meantime, you can grab a PDF download of this graphic below, or purchase it as poster... Trends in periodic table showing the possible and common oxidation states within a compound or must.

oxidation states periodic table

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