Electron configuration of bromine

Electronic configuration of bromine is

$1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{2} 3 d^{10} 4 p^{5}$

Bromine Have 35 electrons.

Initially Shell (n = 1):

The 1s subshell in the first shell can hold up to two electrons at a time, which are positioned in the 1s orbital.

Explanation:

The 2s and 2p subshells are found in the second shell.
A single 2s orbital in the 2s subshell can accommodate two electrons.
Each of the three orbitals of the 2p subshell—2px, 2py, and 2pz—can hold two electrons.
As a result, there are 8 electrons overall in the second shell.

Explanation:

The 3s subshell of the third shell has a single 3s orbital that can accommodate two electrons.
The 3p subshell has three orbitals (3px, 3py, and 3pz), each of which may hold two electrons, for a total of six electrons.
The 3d subshell also has five orbitals (3dxy, 3dxz, 3dyz, 3dx2-y2, and 3dz2), each of which can accommodate two electrons.
Therefore, the 3d subshell can only contain a maximum of 10 electrons.
The third shell can hold a total of 18 electrons when the electron counts from the 3s, 3p, and 3d subshells are added together.

Reason:

The 4s and 4p subshells are located in the fourth shell.
A single 4s orbital in the 4s subshell can accommodate two electrons.
Each of the three orbitals of the 4p subshell—4px, 4py, and 4pz—can hold two electrons.
Therefore, the fourth shell has a total of 6 electrons.