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pure elements
0
monatomic ions
charge of the ion
sum of all oxidation numbers for a neutral compound
0
sum of oxidation numbers for atoms in a polyatomic ion
net charge of ion
Hydrogen
+1 bonded with nonmetals ; -1 bonded with metals
Oxygen
usually -2 ; with peroxides -1 (H2O2) ; with Florine +2
Fluorine
always -1
Halogens
-1 unless with Oxygen or Fluorine since they become positive