Question

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

विकल्प

• \[{[Xe] 4f^75d^16s^2}\]

• \[{[Xe] 4f^65d^26s^2}\]

• \[{[Xe] 4f^86d^2}\]

• \[{[Xe] 4f^95d^1}\]

Answer 1

\[{[Xe] 4f^75d^16s^2}\]

Explanation:

Gadolinium belongs to the 4f series; it has atomic no.= 64. It has extra stability due to a half-filled 4f subshell.

\[\ce{Gd (Z = 64) -> [Xe] 4f^6 5d^2 6s^2}\]