Question

All elements having valency 2 are triatomic.

• A. True
• B. False

Answer 1

The correct option is B False

This statement is false.

Valency of Magnesium is $2$ and hydroxide is $1$ in $Mg(OH{)}_2$ (magnesium Hydroxide) and it is not triatomic. It contains $5$ atoms i.e. one Magnesium, two oxygen and two hydrogen. Electronic configuration of Magnesium is $2,8,2$. It looses $2$ electrons to attain octet. It is easier to loose $2$ electrons than to gain $6$ electrons in order to complete octet. Hence, valency of Magnesium is $2$. It gives its $2$ electrons to $2$ hydroxide ions $\left(O{H}^{-}\right)$ to form bond with it.