The hardness of interstitial compounds is comparable to which of the following?

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,.....................

The correct set of ions (aqueous solution) with the same colour from the following is:

$Zn$ and $Cd$ metals do not show variable valency because

In a transition series,as the atomic number increases,paramagnetism

Which of the following properties is not expected to be shown by copper?