Question

The lanthanide element that has the electronic configuration, $[Xe]4f^{7}5d^{1}6s^{2}$ is

• A. lutetium
• B. terbium
• C. ytterbium
• D. gadolinium

Answer 1

Answer: (D)

gadolinium

Answer 2

The atomic number of gadolinium ($Gd$) is $64$ and its electronic configuration is as
$Gd(64):[Xe]4f^{7}\,5d^{1}6s^{2}$

It is a member of the rare earth elements group. It is silvery white, and a ductile metal with high melting and boiling point.

So, the correct answer is (D): gadolinium