JEE Main20205 Sep 2020Morning ShiftChemistryd and f Block ElementsActual
The correct electronic configuration and spin-only magnetic moment (BM) of Gd 3 + ( Z = 64 ) , respectively, are :
Options
- A[ Xe ] 4 f 7 and 8 . 9
- B[ Xe ] 4 f 7 and 7 . 9
- C[ Xe ] 5 f 7 and 8 . 9
- D[ Xe ] 5 f 7 and 7 . 9
Correct answer
B. [ Xe ] 4 f 7 and 7 . 9
Step-by-step solution
Electronic configuration of 64 Gd = [ Xe ] 4 F 7 5 d 1 6 s 2 Gd 3 + 64 = [ Xe ] 4 F 7 No. of unpaired electron = 7 μ = n ( n + 2 ) BM = 63 = 7 . 93   BM