Question

According to the octet rule, what is true about the reactivity of halogens?

A halogen atom has seven electrons in its valence shell, so halogens are very reactive.
A halogen atom has two electrons in its valence shell, so halogens are very unreactive.
A halogen atom has two electrons in its valence shell, so halogens are very reactive.
A halogen atom has seven electrons in its valence shell, so halogens are very unreactive.

Answer 1

Option (A) is correct,

Answer 2

Answer: A halogen atom has seven electrons in its valence shell, so halogens are very reactive. (Option A)

Explanation: The elements in-group 7 are often referred as “halogens”.  When they form ions, they tend to gain an electron and form negative ions. They are all non-metals and their reactivity down the group decreases because the atomic radius increases in size (so fluorine is the most reactive halogen of group 7)