What is meant by electronic configuration

Electronic configuration 

Electronic configuration is the distribution of electrons in the shell of an atom of the element.

The  shells in atom are represented by the letters K, L, M, N, ………

The number of maximum electrons that can be accommodated in a given shell is determined by the formula 2n².

‘n’ is the orbit number

Orbit (shell) number	Maximum no. of electrons – 2n2
K shell – n=1	2x 12 =2
L shell – n=2	2x 22 =8
M shell – n=3	2x 32 =18
N shell – n=4	2x 42 =32

Note : Valence shell will not have more than 8 electrons.

Click here for the electronic configurations of first twenty elements