An element is in $M^{3+}$ form. Its electronic configuration is $[Ar]3d^1$. The ion is:

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

Which metal exhibits more than one oxidation state?

The metal ion which does not form coloured compounds is

Which of the following ions exhibits a $3d^0 4s^0$ electronic configuration?

Find the species having the magnetic moment value of $5.92 \ BM$.