How can a metal in group 2 of the periodic table become a chemically stable ion?

A metal in group 2 of the Periodic Table, such as magnesium or calcium, can become a chemically stable ion by losing its two valence electrons. This process forms a cation with a +2 charge, leading to a stable electron configuration similar to that of the nearest noble gas. The loss of these electrons allows the metal to achieve a lower energy state and greater stability, as it fulfills the octet rule.