Question

The outer electronic configuration of Gd (Atomic No: 64) is:

• A. $4f^{8}5d^{0}6s^2$.
• B. $4f^{4}5d^{4}6s^2$.
• C. $4f^{7}5d^{1}6s^2$.
• D. $4f^{3}5d^{5}6s^2$.

Answer 1

The correct option is C $4f^{7}5d^{1}6s^2$.

Gadolinium $\left(X_{6}4Gd\right)=[Xe{]}^{54}4f^{7}5d^{1}6s^2$.