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Sep 20th, 2015
An ion is an atom (or group of atoms) that has gained or lost one or more electrons. Many main group elements gain or lose electrons such that they have the same number of electrons as a Noble gas. Calcium, and all of the alkaline earth elements, lose two electrons. Since electrons are negatively charged, the loss of electrons gives the resulting ion a positive charge. So the answer is that the calcium ion has a 2+ charge.
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