Question

write the ground state electron configuration of br using the noble - gas shorthand notation.
electron configuration:

Explanation:

Step1: Determine the atomic number of Br

The atomic number of Br (bromine) is 35.

Step2: Find the nearest noble gas with a lower atomic number

The nearest noble gas with a lower atomic number than 35 is Ar (argon), which has an atomic number of 18.

Step3: Write the electron configuration for the remaining electrons

After accounting for Ar (\(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}\)), we have \(35 - 18=17\) electrons left.
The remaining electrons fill the \(4s\), \(3d\), and \(4p\) orbitals. The \(4s\) orbital fills first (\(4s^{2}\)), then the \(3d\) orbital (\(3d^{10}\)), and then the \(4p\) orbital (\(4p^{5}\)).

Answer:

\([Ar]4s^{2}3d^{10}4p^{5}\)