Question

Atomic number of neon is 10. What is its valency?

• A. 0
• B. 1
• C. 2
• D. 3

Answer 1

The correct option is A 0

Number of electron in neon = 10

Hence, the electronic configuration of neon is-
$$\begin{array}{ccc}\text{Shell}& \text{K}& \text{L}\\ \text{No. of electrons}& \text{2}& \text{8}\end{array}$$
Number of valence electrons in neon = 8
If the number of valence electrons is greater than four, valency = 8 - number of valence electrons.
Hence, valency of neon = 8 - 8 = 0.