Find the value of spin-only magnetic moment for chromium cation in $+2$ state. (in $BM$)

Which ion has the highest magnetic moment (only spin)?

The metal that has a very low melting point and whose periodic position is close to a metalloid is:

Transition metals are not characterized by

Although Zirconium $(Zr)$ belongs to the $4d$-transition series and Hafnium $(Hf)$ belongs to the $5d$-transition series, they show similar physical and chemical properties because . . . . . . .

Which of the following has the maximum number of unpaired electrons?