Question

The maximum number of electrons that can be accommodated in the M-shell of an atom is ______.

Answer 1

Definition of electronic configuration.

The arrangement of electrons in various energy levels(or shells) of an element is called electronic configuration.

The maximum number of electrons that can be accommodated in any shell of an atom is given by 2n².

For the 3rd shell (M-shell), n = 3

The maximum number of electrons in third shell $=2\times {\left(3\right)}^2=18$

Therefore the maximum number of electrons that can be accommodated in the M-shell of an atom is 18.