Question

The number of electrons with +
spin in n = 3 is​

Answer 1

The maximum number of electronsthat can fit inside a 'n' shell is 2n^2. So it is 18. The principle quantum number'n' defines the shell and not the orbital. A shell has multiple orbitals in it and each orbital can take a maximum of two electrons - one spinning clockwise and the other anti-clockwise.

Answer 2

Explanation:

$no.of \: electrons = {2n}^{2}$

$here \: n = 3$

$so \: 2 ({3})^{2}$

$= 18$