Question

Each element present in the periodic table has a unique valency.

• A. True
• B. False

Answer 1

The correct option is B False

Valency is the combining capacity of an element. When an element has different combining capacities, it is said to enhibit varaiable valency. Hence, all the elements do not have a unique valency.

However, some elements do have the same valancies. Given below are few elements along with their valancies.

$$\begin{array}{cc}\text{Element}& \text{Valency}\\ \text{Sodium}& \text{1}\\ \text{Hydrogen}& \text{1}\\ \text{Carbon}& \text{4}\\ \text{Oxygen}& \text{2}\end{array}$$