The atomic number of $Pd$ is $46$. The atomic numbers of the elements lying immediately above and below it in the same group are,respectively,.....................

$A$ chloro compound of vanadium has a spin-only magnetic moment of $1.73 \ BM$. This vanadium chloride has the formula:

The $3d$ elements show variable oxidation states because the energies of the following sets of orbitals are almost similar:

Which metal exhibits more than one oxidation state?

Which of the following statements are correct about $Zn$,$Cd$ and $Hg$?
$(I)$ They exhibit high enthalpies of atomisation as the $d-$subshell is full.
$(II)$ $Zn$ and $Cd$ do not show variable oxidation states while $Hg$ shows $+I$ and $+II$.
$(III)$ Compounds of $Zn$,$Cd$ and $Hg$ are paramagnetic in nature.
$(IV)$ $Zn$,$Cd$ and $Hg$ are called soft metals.

The number of $4f$ electrons in the ground state electronic configuration of $Gd^{2+}$ is ........ .
[Atomic number of $Gd=64$]