Question

Which of the statements correctly describes the reactivity of halogens, according to the octet rule?
They have two electrons in their valence shell, so halogens are very unreactive. They have seven electrons in their valence shell, so halogens are very unreactive. They have seven electrons in their valence shell, so halogens are very reactive. They have two electrons in their valence shell, so halogens are very reactive.

Answer 1

They have seven electrons in their valence shell, so halogens are very reactive.
Hope this helps! :)

Answer 2

Answer:

They have seven electrons in their valence shell, so halogens are very reactive.

Explanation:

The halogens are the elements of the group 17 (or 7A) of the periodic table, all the elements have the valence shell $s^{2}p^{5}$, so they have 7 electrons in their valence shell.

These elements need only one electron to be stable according to the octet rule, so they are very reactive, they can react with metals, non-metals, hydrogen and with themselves.