max oxidation number of most atoms in its compounds is
equal to its periodic group number
min oxidation number of hydrogen is
min number for nonmetallic atom is
equal to its group number minus 8
min number for metallic atom is
oxidation number of every monatomic ion is
equal to its charge
oxidation number of every alkali and alkaline earth metal is
equal to its group number
oxidation number of hydrogen in compounds is +1 except
when hydrogen is combined with active metals
oxidation number of halogens is -1 except
for a Cl, Br, or I atom combined with oxygen or a halogen atom higher in the periodic table
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