Question

Match the given elements with their respective valency.

• A. 1
• B. 3
• C. 0
• D. 2

Answer 1

$\bullet$ Valency is the combining capacity of an element and is determined by the number of valence electrons.

$\bullet$ When the number of valence electrons are four or less, valency is equal to the number of valence electrons.

$\bullet$ When the valence electrons are more than four, valency is obtained by subtracting the valence elctrons from eight.

$$\begin{array}{cccc}\text{Atom}& \text{Electronic Configuration}& \text{No. of valency electrons}& \text{Valency}\\ \text{Oxygen}& \text{2,6}& \text{6}& \text{8 - 6 = 2}\\ \text{Neon}& \text{2,8}& \text{8}& \text{8 - 8 = 0}\\ \text{Hydrogen}& \text{1}& \text{1}& \text{1}\\ \text{Aluminium}& \text{2,8,3}& \text{3}& \text{3}\end{array}$$