Question

The total number of unpaired electrons, present in an atom of $Gd(64)$, are:

• A. 7
• B. 8
• C. 1
• D. 10

Answer 1

Answer: (B)

$Gd\to 4f^{7}5d^{1}6s^2$

Number of unpaired electrons : 7 in $4f$ and 1 is $5d$