Question

How many maximum number of eletrons in third shell?

Answer 1

The maximum number of electron which can be present in an orbit of an atom is equal to 2n^2. Where n is the number of energy shell or orbit.

n = 3
= 2×(3)^2
= 18
Hence, the maximum number of electron in third shell is 18.

Answer 2

The maximum number of electrons present in the third shell is 2n^2(Bohr-bury scheme):-

Here n is the no of shell ie here n=3

2n^2
=2*3^2
=2*9
=18