Question

Gadolinium belongs to the $4f$ series. Its atomic number is $64.$ Which of the following is the correct electronic configuration of gadolinium?

• A. $\left[Xe\right]4f^{9}5s^1$
• B. $\left[Xe\right]4f^{6}5d^{2}6s^2$
• C. $\left[Xe\right]4f^{8}6d^2$
• D. $\left[Xe\right]4f^{7}5d^{1}6s^2$

Answer 1

The correct option is D $\left[Xe\right]4f^{7}5d^{1}6s^2$

The atomic number of gadolinium $\left(Gd\right)$ is $64.$

The electronic configuration of gadolinium is: $\left[Xe\right]4f^{7}5d^{1}6s^2$

So, option $\left(A\right)$ is the correct answer.