what is group oxidation state
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An element in a free form has OS=0. In a compound or ion, the oxidation-state sum equals the total charge of the compound or ion. Group 1 and 2 metals in compounds have OS = +1 and +2 , respectively. Hydrogen has OS = +1 but adopts -1 when bonded to metals or metaliods. Oxygen in compounds has OS = -2.
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