Calcium
Calcium is the
chemical element in the periodic table that has the symbol Ca and atomic number 20. Calcium is a soft grey alkaline earth metal that is used as a
reducing agent in the extraction of
thorium,
zirconium and
uranium. Calcium is also the fifth most abundant element in the
Earth's crust.
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Encyclopedia
Calcium is the
chemical element in the periodic table that has the symbol
Ca and atomic number 20. Calcium is a soft grey alkaline earth metal that is used as a
reducing agent in the extraction of
thorium,
zirconium and
uranium. Calcium is also the fifth most abundant element in the
Earth's crust.