Q.67:- (a) How many sub-shells are associated with n = 4 ? (b) How many electrons will be present in the sub-shells having ms value of –1/2 for n = 4 ?
(a) n=4, l = 0, 1, 2, 3. 4 sub-shells are associated with n = 4
(b) No. of orbitals in the shells = n2 = 42 = 16
Each orbitals has one electron with ms = -1/2. Hence, there will be 16 electrons with ms = -1/2.