Oxidation states in order of importance

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Last updated 6:39 PM on 6/14/26

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1

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Group 1

+1

2

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Group 2

+2

3

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Aluminium

+3

4

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Fluorine

-1

5

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Hydrogen

+1 except in metal hydrides (eg NaH) when it is -1

6

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Oxygen

-2 except in peroxide ions (eg H²O²) when it is -1 & Fluorine (OF²) when it is +2

7

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Other halogens

-1 except Chlorine with Oxygen when it can be positive