Question

Which of the following properties do not match with elements of the halogen family?

• A. They have seven electrons in their valence shell
• B. They are highly reactive chemically
• C. They are metallic in nature
• D. They are diatomic in their molecular form

Answer 1

Answer: (C)

They are metallic in nature

Halogens have $n{s}^2{p}^5$ configuration so they have $7$ valence shell electrons.

As they have $7$ valence electron so they have a high tendency to gain one electron and are non-metallic.

Due to incomplete octet, they are highly reactive and exists as diatomic in molecular form as $X_2$.

Hence, the correct option is $\text{C}$