Point out the followings:
(a) How many energy subshells are pssible in ` n=3` level ?
(b) How many orbitals of all kinds are possible in ` n=3` level ?

Explanation

(a) No. of subshells in a shell = no . Of shells = 3
(b) No. of orbitals = `( "no. of shell")^2 = 3^2 =9`.