Question

The electronic configuration of gadolinium atomic no $64$ is

• A. $\left[\text{Xe}\right]4f^{3}5d^{5}6s^2$
• B. $\left[\text{Xe}\right]4f^{6}5d^{2}6s^2$
• C. $\left[\text{Xe}\right]4f^{8}5d^{9}6s^2$
• D. $\left[\text{Xe}\right]4f^{7}5d^{1}6s^2$

Answer 1

The correct option is D

$\left[\text{Xe}\right]4f^{7}5d^{1}6s^2$

Explanation:

Electronic configuration:

• The distribution of electrons into orbitals of an atom is called its electronic configuration.

Electronic configuration of Gadolinium:

• The symbol for Gadolinium is $\text{Gd}$ and has atomic number $64$.
• The electronic configuration of gadolinium is $\left[\text{Xe}\right]4f^{7}5d^{1}6s^2$.
• $\text{Gd}$ is an f-block element and belongs to the lanthanide series.

Hence, the correct option is (D). The electronic configuration of gadolinium atomic no $64$ is $\mathbf{\left[}\mathbf{\text{Xe}}\mathbf{\right]}\mathbf{4}{\mathbf{f}}^{\mathbf{7}}\mathbf{5}{\mathbf{d}}^{\mathbf{1}}\mathbf{6}{\mathbf{s}}^{\mathbf{2}}$.