Chemistry Question on Classification of elements & periodicity in properties

Question

The valence shell electronic configuration of an element is $\text{ns}^{2} \text{np}^{5} .$ The element will belong to the group of -

Answer 1

Solution

$Halogen \, Family\Rightarrow n s^{2}n p^{5}$ All halogens contain seven electrons in their outermost shell. All other shells are completely filled. These elements require only one electron to complete their octet.