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Pure Elements, O2, H2, or Fe
= 0
Single atom ions, Na+ or Cl-
Equal to ions charge
Fluorine in compounds
= -1
Group 1 metal
= +1
Group 2 metals
= +2
Hydrogen in most compounds
= +1
Oxygen in most compounds
= -2
Group 17 elements or Halogens
= -1
All Oxidation numbers combined
= the total charge