Question

Number of unpaired electron present in Gadolinium is________

Answer 1

Answer: 8

Gadolinium is the element present in lanthanide series which has atomic number $64$ .
Electronic configuration of Gadolinium is
${}_{64}Gd:\left[Xe\right]4f^{7}5d^{1}6s^2$
All electrons in $5d\&4f$ are unpaired.
So, number of unpaired electrons is $8$ .