Question

What is the maximum number of electrons that can exist in the second shell surrounding the nucleus?

Answer 1

⤵⤵

By using the formula

$2 {n}^{2} \: where \: \: n \: \: is \: \: \: number \: \: \: of \: shell$

Hence,

↪Q=8electrons↩

Answer 2

by using the bohr formula

2n^2 where n is no. of shells