Question

What is the maximum number of electrons that can occupy in n is equal to 3 shell?

Answer 1

The maximum electrons are

K=2 (ist shell)

L=8 (2nd shell)

M=8 (3rd shell)

Total=18 electrons

Answer 2

You can use 2 n^2 to find the number of electron .


Where n ( shell number)


So, in this question shell number is 3


So 2 (3)^2

2 x 9

18


But if 3rd shell is last shell then electron number may vary

For example, elements in group 3 will have only 3 electron in its outer shell

Elements in group 4 will have only 4 electron in outer shell