The electronic configuration of gadolinium (Atomic number 64) is

Options

A. [Xe] `4f^(8), 5d^(9), 6s^(2)`
B. [Xe] `4f^(7), 5d^(1), 6s^(2)`
C. [Xe] `4f^(6), 5d^(2), 6s^(2)`
D. [Xe] `4f^(3), 5d^(5), 6s^(2)`

Answer

B

Explanation

(b) `Gd_(64)=1s^(2),2s^(2)2p^(6),3s^(2)3p^(6)3d^(10), 4s^(2)4p^(6)4d^(10)4f^(7),5s^(2)5p^(6)5d^(1),6s^(2)`
`=[Xe]4f^(7),5d^(1),6s^(2)`