One of the excited states of Ti has the electric configuration $[\mathrm{Ar}] 4 \mathrm{s}^{2} 3 \mathrm{d}^{1} 4 \mathrm{p}^{1}$. The number of microstates with zero total spin (S) for this configuration is
(a)9
(b)15
(c)27
(d)60
Answer
Answer: B ✓ checked by 4AB · confidence high
Explanation
4s² is closed; 3d¹4p¹ gives 10 × 6 = 60 microstates. Singlet terms ¹P, ¹D, ¹F have 3 + 5 + 7 = 15 microstates with S = 0.