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.

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)

is there multiple choice answers?

the correct answer to this question is 2