Question

What is the electron configuration of a bromide ion?

Answer 1

Well, is it not isoelectronic with krypton....?

Explanation:

For atomic `Br`, we have `Z=35`, and thus for `Br^-` we gots 36 electrons to distribute in the usual way......

`1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)4s^(2)3d^(10)4p^6`