Write an equation that shows the formation of a calcium ion from a neutral calcium atom.

Calcium has a chemical symbol of Ca and has an atomic number of 20. This means that a neutral calcium ion will have 20 protons and 20 electrons. As part of Group 2 (alkaline earth metals), a calcium ion will be formed by ejecting 2 electrons from the neutral Ca atom. In chemical equation,
                           
                                           Ca --> Ca²⁺ + 2e⁻

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