Question

Calculate the maximum number of electrons in 1st, 2nd, 3rd, and 4th shells.

Answer 1

Maximum number of electrons in a shell is given by 2n².

Shell	Value of ‘n’	Max. number of electrons
First	1	$2\times \left(1^2\right)=2$
Second	2	$2\times \left(2^2\right)=8$
Third	3	$2\times \left(3^2\right)=18$
Fourth	4	$2\times \left(4^2\right)=32$