Calcium typically forms a +2 ion when it becomes an ion.
Explanation: Calcium is a chemical element with the symbol Ca and atomic number 20. It is an alkaline earth metal, located in Group 2 of the periodic table. To achieve a stable electronic configuration, calcium tends to lose two electrons from its outer shell. This loss of electrons results in a net positive charge of +2, meaning that a calcium ion (Ca2+) has two more protons than electrons. This +2 charge allows calcium to readily participate in various chemical reactions, contributing to its role in biological systems and other compounds.