Justify the mentioning two reasons, the inclusion of Ca and Mg in the same group of the periodic table.

Explanation

(1) Both Ca and Mg have similar electronic configuration. Both of them belong to s-block.
Electronic configuration of `Mg:1s^(2)2s^(2)2p^(6)3s^(2)`
Electronic configuration of `Ca:1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)4s^(2)`
(2) Both are typical divalent metals and form stable ionis compounds e.g., `MgCl_(2), CaCl_(2),MgO,CaO`.