The elements with full $d^{10}$ electronic configuration in their $+2$ oxidation state are

The atomic radii of the elements are almost the same for which series?

Highest $(+7)$ oxidation state is shown by

Which of the $3d$ series of the transition metals exhibits the largest number of oxidation states and why?

The electronic configuration of a metal element is given below:
$M = 1s^2 2s^2 2p^6 3s^2 3p^6 3d^{10} 4s^1$
To which block does this element belong?

Which of the following statements is incorrect?