Question

How many electrons are in a shell?

Answer 1

Every shell can occupies a specific number of electrons.

To determine the number of electrons, the general formula:

$2\left(n^2\right)$ where $n$ is the shell number

For $n=1$ , the shell holds $2e^{-}$ i.e. the first shell,

For $n=2$ , the shell holds $8e^{-}$ i.e. the second shell,

For $n=3$, the shell holds $18e^{-}$ i.e third shell and so on.

Therefore, the above paragraph listed the electrons occupied by each shell.