The outer electronic configuration of Gd (Atomic number 64) is

Options

A. `4t^(3)5d^(5)6s^(2)`
B. `4f^(8)5d^(0)6s^(2)`
C. `4f^(4)5d^(4)6s^(2)`
D. `4f^(7)5d^(1)6s^(2)`

Answer

D

Explanation

Gd(64) has electronic configuration as `[Xe]_(54)4f^(7)5d^(1)5s^(2)` instead of `[Xe]_(54)4f^(8)6s^(2)`.