Oxidation Numbers General Rules

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15 Terms

1
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an atom in its elemental form (Na, O2,Cl2, etc.)

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2
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monoatomic ion

ion charge

3
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polyatomic ion

ion’s charge

4
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group 1A

+1 in all compounds

5
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group 2A

+2 in all compounds

6
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hydrogen in combination with nonmetals

+1

7
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hydrogen in combination with metals and boron

-1

8
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fluorine

-1 in all compounds

9
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oxygen in peroxides

-1

10
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oxygen in other compounds except with F

-2

11
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group 7A

-1 in combination with:

  • metals

  • non-metals (except O)

  • other halogens lower in the group

12
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polyatomic ion

add up to the ion’s charge

13
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neutral molecules and formula units

0

14
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group 6A

-2

15
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group 5A

-3