Which of the following has '$6$' unpaired $f-$electrons ?
$Tm^{+3} (Z = 69)$
$Nd^{+3} (Z = 60)$
$Dy^{+3} (Z = 66)$
$Tb^{+3} (Z = 65)$
Which of the following transitional metal has lowest boiling point (B.P.)
In which of the following metallic bond is strongest
German silver is an alloy of $Cu$ with
Transition metals are often paramagnetic owing to
A copper salt is isomorphic with $ZnS{O_4}$, the salt will be