Oxidation numbers

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12 Terms

1
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Atom of a free element

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  • Cl in Cl2

  • H in H2

  • S in S8

2
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A monatomic ion

Oxidation number is equal to its charge

  • Cu2+ is +2

  • Br- is -1

3
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Alkali (Group 1A) when combined with other elements

+1

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Alkaline group

+2

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Flourine

Always -1

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Hydrogen

Has an oxidation number of (+1) in most compounds

7
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Hydrogen is combined with metals,

-1

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Oxygen

-2

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Oxygens in peroxides

-1

H2O2

Na2O2

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Other halogens (Cl, Br, and I)

-1

11
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Halogens combined with oxygen and fluorine

Cl in the ion CIO, is +7

-1 = x + 4 (-2)

-1 = x−8

7 = x

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The sum of the oxidation numbers for all atoms in a neutral compound

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