# What is the electron configuration of a bromide ion?

Jul 20, 2017

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

#### Explanation:

For atomic $B r$, we have $Z = 35$, and thus for $B {r}^{-}$ we gots 36 electrons to distribute in the usual way......

$1 {s}^{2} 2 {s}^{2} 2 {p}^{6} 3 {s}^{2} 3 {p}^{6} 4 {s}^{2} 3 {d}^{10} 4 {p}^{6}$