Oxidation Number Rules
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Last updated 5:42 PM on 10/8/25
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7 Terms
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O.N. of atoms in a neutral molecule sum to zero;
O.N. of atoms in an ion sum to charge on the ion
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Each atom in a pure element has O.N. =
0
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In monatomic ion, O.N.
charge on the ion
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Fluorine
O.N. = -1 in all compounds
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Hydrogen
+1, except if paired with metal (hydrides where hydrogen = -1)
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Oxygen
-2 in most compounds (except in peroxides where oxygen = -1)
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Br and Cl
-1 O.N, unless combined with O or F
Note 
Flashcards (64)