Oxidation States

Element = Oxidation State

Hydrogen = +1 (except in metal hyrdrides (NaH) where it equals -1)

Group 1  = +1

Group 2  = +2

Aluminium =  +3

Oxygen = -2 (Except in peroxides = -1 and in compounds with OF2 where it is +2

Flourine = -1

Chlorine = -1 (Except in compounds with F and O where it has a positive value due to F and O being more electornegative