Oxidation number rules + Mnemonics
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10 Terms
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Element by itself not bonded to any other element
Always 0.
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Group 1 elements
Always +1.
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Group 2 elements
Always +2.
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Halogens
Usually have an oxidation number of -1, positive with oxygen.
5
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Fluorine (F)
Always has an oxidation number of -1.
6
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Oxygen (O)
Usually has an oxidation number of -2, but is -1 in peroxides.
7
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Hydrogen (H)
+1 with nonmetals and -1 with metals.
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Sum of oxidation numbers for a neutral compound
Always equals 0.
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Sum of oxidation numbers for a polyatomic ion
Equals the ion charge.
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Monatomic ion
Its charge is the oxidation number.
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