Question

An element $X$ belongs to $3^{rd}$ period and ${17}^{th}$ group, state
(ii) Name of the element.

Answer 1

The name of the element that belongs to the $3^{rd}$ period and ${17}^{th}$ group is Chlorine $\left(Cl\right)$.

Explanation:

• Period $3$ defines that it has $3$ shells
• Group 17 defines that it has $7$ valence electrons.
• Thus, the electronic configuration of the elements is $2,8,7$ so the atomic number is $17$.

Therefore, the element must be chlorine.