Metals (M) in group 2 of the periodic table form ionic bonds

with nonmetals (X) present in group leading to

formation of ionic compound with general formula of MX.

a

17

b

16

c

18

d

15

16

Explanation:

Group two elements are alkaline earth metal.

All these have two valance electrons. In order to achieve noble gas configuration it loses its two valance and get complete octet.

Reaction with group 16.

Reaction with oxygen,

They react with oxygen and form oxide.

2Ba + O₂ → 2BaO

2Mg + O₂ → 2MgO

2Ca + O₂ → 2CaO

this oxide form hydroxide when react with water,

BaO + H₂O → Ba (OH) ₂

MgO + H₂O → Mg (OH) ₂

CaO + H₂O → Ca (OH) ₂

With sulfur,

Mg + S → MgS

Ca + S → CaS

Ba + S → BaS