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the sum of all oxidation numbers in neutral compounds
zero
sum of all oxidation numbers in a polyatomic ion
= the charge
atoms in elemental form (including diatomics)
0
Monoatomic ion
same as the charge
F in compounds
-1
H in compounds with nonmetals
+1 (when with metals= -1)
O in compounds
-2 (H202= -1, OF2=+2)
Group 1 metals
+1
Group 2 metals
+2
Cl, Br, and I
-1 (when in compounds with more than 2 elements it may vary)