SSC MTS EXAM

Detailed explanation-1: -So the number of valence electrons are 7 for halogens.

Detailed explanation-2: -The halogen atoms carry seven valence electrons in their outermost electron shell. These seven outermost electrons are in two different kinds of orbitals, designated s (with two electrons) and p (with five).

Detailed explanation-3: -Therefore, halogens have seven valence electrons. The halogens are among the most reactive of all elements, although reactivity declines from the top to the bottom of the halogen group. Because all halogens have seven valence electrons, they are “eager” to gain one more electron.