HOLD ON TIGHT - THIS IS FAST! Deduce the oxidation number of an element in a compound. 6 rules:1) Elements have ON of 02) Sum of the ON in a substance = charge on substance3) H in a compound =+1 (except when with a metal = -1)4) O in a compound =-2 (except in H2O2, where O=-1)5) F in a compound is -16) Group 1,2,3 metals have oxidation numbers of +1,+2 and +3 respectively. Most other metals have variable oxidation numbers.
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