Calcium

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 * Calcium ** is a [|chemical element] . Its symbol on the [|periodic table] (a list of all the elements) is ** Ca ** . Its [|atomic number] is 20. (The atomic number says where Calcium sits in the periodic table.) It has 20 [|protons] and 20 [|electrons] (if is an atom, see [|ion] ). The most common [|isotopes] are Ca-40 and Ca-44. Its [|mass number] is about 40.08. Calcium is very important in the human body, It is required for minerals and bones. (link)

=Calcium - Periodic Table of Videos= media type="custom" key="22059174" Uploaded on Dec 13, 2010

=Calcium - The Element in Action= media type="custom" key="22059344"

=Project: Calcium- It's Elemental= media type="custom" key="22059366"