CH1012
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6
OXIDATION STATE RULES III
e.g.    H - F  H + I F - I
Generally :
F always has an oxidation state of - I        
O normally has an oxidation state of - II        
H has an oxidation state of + I
THE SUM OF OXIDATION NUMBERS IN A FORMULA MUST EQUAL THE CHARGE WRITTEN FOR THE FORMULA
 e.g OH-    O  - II     H + I       sum = - I
       ClO4-    O  - II     Cl +VII   sum = - I (4x-2+7)