Question

write down the oxidation number (o.n) of atom .above its symbol

Answer 1

Oxidation number of all alkaline earth metal ions is always = +2. Oxidation number of all boron family metal ions is always = +3. Oxidation number of hydrogen in proton (H+) is +1, and in hydride is -1. Oxidation number of oxygen in oxide ion(O2-) is -2, and in peroxide ion(O-O2-) is -1.

I hope it's help you please like