The valence shell electronic configuration of $Cr^{2+}$ ion is

Which of the following is a soft metal?

Identify the element if its observed and expected electronic configuration is considered,specifically focusing on the transition metal series where $d$-orbital filling occurs.

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

An amalgam is $.......$

Because of lanthanoid contraction,which of the following pairs of elements have nearly same atomic radii? (Numbers in the parenthesis are atomic numbers)