Calcium is a chemical element with symbol Ca and atomic number 20. Calcium is
a soft gray ...... Tokyo, Japan: The International Technical Information Institute.
Element Calcium (Ca), Group 2, Atomic Number 20, s-block, Mass 40.078.
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The Element Calcium - Basic Physical and Historical Information.
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Apr 25, 2013 ... Properties, sources and uses of the element calcium.
Calcium's properties, discovery, videos, images, states, energies, ... (Berzelius,
the great Swedish chemist, exchanged a great deal of information with Davy.
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Calcium is a chemical element with the symbol Ca and an atomic number of 20.
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Mar 19, 2013 ... The body needs calcium to maintain strong bones and to carry out many .... For
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