Answer:
Bromine
Explanation:
We know that all halogens have seven valence electrons. So form given options bromine , iodine and chlorine could be the given atom but it should be the one which have 4 electronic shells. It will confirm from electronic configuration.
Electronic configuration of Br:
Br₃₅ = [Ar] 4s² 3d¹⁰ 4p⁵
Bromine have 4 electronic shell.
Electronic configuration of Iodine:
I₅₃ = [Kr] 4d¹⁰ 5s² 5p⁵
Iodine have 5 electronic shells.
Electronic configuration of Chlorine:
Cl₁₇ = [Ne] 3s² 3p⁵
Thus correct option is bromine.
