electrons

How many electrons are there in a calcium ion Ca2+? It is a multiple choice question. The choices are 19, 18, 21, 20, 22? :roll:

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Do you know how many electron there are in regular CA? It's on this website if you look. :roll:

Ca has 20 electrons. You can see that on the periodic table.
Ca 2+ has 20-2=18 electrons.

WebElements: the periodic table on the WWW [http://www.webelements.com/]

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