Redox - Oxidation states rules
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Last updated 9:43 PM on 11/18/25
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12 Terms
1
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if oxidation number increases…
oxidation occurs
2
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if oxidation number decreases…
reduction occurs
3
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element in free state
always 0
4
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monatomic ion
equals its charge
5
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complex ions
oxidation states add up to charge
6
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flourine
always -1
except as an element = 0
7
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oxygen
usually -2
except as an element = 0
in peroxides annd with flourine = -1
8
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hydrogen
usually +1
except as an element = 0
or in metal hydrides = -1
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halogens
usually -1
except as an element = 0
or when bonded to more electronegative elements
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Group 1 metals
Always +1
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Group 2 metals
Always +2
12
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Transition metals
Can vary
