Question

The maximum number of electrons that can be present in the first shell is/are .

• A. 1
• B. 2
• C. 3
• D. 4

Answer 1

The correct option is B 2

The number of electrons in a shell can be calculated by the formula $2n^2$.
where 'n' represents the shell number.
For the first shell, according to the $2n^2$ rule
$2\times 1^2$ = 2.
Thus, the first shell can accomodate a maximum of two electrons.