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A phosphate , an inorganic chemical , is a salt of phosphoric acid . ..Calcium is the chemical element with the symbol Ca and the atomic number 20 . It has an Atomic Mass of 40.078 amu. Calcium is a soft grey alkaline earth metal , and is the fifth most abundant element by mass in the earth's crust . Calcium is also the fifth most abundant dissolved ion in seawater by most molarity and mass , after sodium , chloride , magnesium and sulfate .

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15y ago

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