The atomic number of an element is $22$. The highest oxidation state exhibited by it in its compounds is

Which element from the following is a soft element?

Why are transition elements less electropositive than the metals of group-$1$ and group-$2$?

From $+6$ to $+1$ oxidation state is shown by the element of ....... group.

Ferrous ion changes to $X$ ion upon reacting with acidified hydrogen peroxide. The number of $d$-electrons present in $X$ and its magnetic moment (in $BM$) are,respectively:

The electronic configuration of $Gd^{2+}$ is (at. no. of $Gd$ is $64$)