Why do chlorine, bromine and iodine exhibit +3, +5 and +7 oxidation states in addition to - 1 and +1 oxidation tes?

Explanation

Cl, Br and I have only one unpaired electron in their ground state. Therefore, they exhibit an oxidation state of -1 or +1. However, they have 3, 5 and 7 unpaired electrons in their first, second and third excited states, respectively. Hence, they also exhibit the oxidation states of +3, +5 and + 7.