Oxidation States

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10 Terms

1
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uncombined element/atom

0

2
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hydrogen

+1 (apart from metal hydrides e.g. NaH)

3
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group 1

+1

4
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group 2

+2

5
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aluminium

+3

6
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oxygen, O

-2

7
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compound

sum is zero

8
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flourine

-1

9
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reaction 1 of chlorine not fully used up

Cl2 + H2O ⇌ HClO + HCl

10
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reaction 2 of chlorine fully used up - lots of sunlight

2Cl2 + 2H2O ⇌ 4HCl + O2