Question

Electronic configuration of an element $A$ is $1s^{2}2s^{2}2p^{6}3s^1$ and electronic configuration of another element $B$ is $1s^{2}2s^{2}2p^{6}3s^{2}3p^4$. The possible compound that can be formed between $A$ and $B$ is :

• A. $AB$
• B. $A{B}_2$
• C. $A_{2}B$
• D. $A_2{B}_3$

Answer 1

The correct option is C $A_{2}B$

Valence electron in element $A$ is 1. Thus, valency is 1.
Valence electrons in element $B$ is 6. Thus, valency is (8-6) = 2.
So, the possible compound is $=A_{2}B$