Rules for oxidation states

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10 Terms

1
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1

The oxidation state of an atom in a free element is 0

2
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2

The oxidation state of a monoatomic ion is equal to its charge

3
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3

The sum of the oxidation states of all atoms in:

  • A neutral molecule or formula unit is 0

  • An ion is equal to the charge of the ion

4
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4

In their compounds, metals have positive oxidation states

  • Group 1A metals always have an oxidation state of +1

  • Group 2A metals always have an oxidation state of +2

5
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F

-1

6
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H

+1

7
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O

-2

8
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Group 7A

-1

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Group 6A

-2

10
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Group 5A

-3