Question

Define Valency.

Answer 1

Valency:-

• Valency is defined as combining power of an element with other atom to form chemical bond.
• Valency refers to electron in outer shell of an atom.
• Example, $Na(2,8,1)$ Valency of $Na$ is $1$

$Cl(2,8,7)$ Valency of $Cl$ is $1$. Chlorine is short of one electron to complete its octet.