The electronic structure $(n - 1)d^{1 - 10}ns^{0 - 2}$ is characteristic of

Which of the following is a colourless ion?

Which metal is used to make alloy steel for armour plates,safes and helmets?

What is the total number of transition series of $d$-block elements?

Which of the following elements is not considered a transition element?

Which of the following elements in their respective oxidation states does not develop spin only magnetic moment? $[Ti (Z=22), Zn(Z=30), V(Z=23), Cu(Z=29)]$