How do you write the noble-gas electron configuration for bromine?

1 Answer
Nov 21, 2014

The noble gas configuration for bromine is :

$\left[A r\right] 3 {d}^{10} 4 {s}^{2} 4 {p}^{5}$

The previous noble gas is argon which has the electron configuration of :

$1 {s}^{2} 2 {s}^{2} 2 {p}^{6} 3 {s}^{2} 3 {p}^{6}$

We call this the argon core. It's a handy way of writing out electron structures without writing all the inner electron shells.