What is unique about the halogen family?

Answer 1

Halogens are highly reactive. This high reactivity is due to the high electronegativity of the atoms due to their high effective nuclear charge. They can gain an electron by reacting with atoms of other elements.

Answer 2

The halogen family is unique because its elements are highly reactive nonmetals that readily form compounds with other elements. They all have seven electrons in their outer shell, making them collectively known as Group 17 on the Periodic Table. Additionally, they exhibit similar physical and chemical properties, such as color and odor.