Question

Suma has two packets with label X (metal) and Y (non metal) . The valency of X=1 and Y=2. Name any metal, which can be 'X' and any non metal, which can be 'Y'. Write down the formula of any compound formed by them.

Answer 1

X can be Sodium

Conditions:-

Sodium is metal
Sodium's configuration is 2,8,1
Valency is one

Satisfied.. ;)

Y can be Oxygen

Conditions:-
Oxygen is not metal
Oxygen's configuration is 2,6
Valency of oxygen is 2

Satisfied.. ;)

Now compound:-

4Na +O2 --> 2Na2O