AP EAPCET 20-Aug-2021 Shift 2 Paper

n=3, means 3‌rd shell
Azimuthal quantum number, l=n−1
⇒l=0,1,2
(0 means s subshell, 1 means p subshell and 2 means d subshell)
So, l=2 means d subshell
∴3d subshell can accommodate maximum 2(2l+1) = 10 electrons.