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QUESTION

What is the formula for calcium sulfate?

##CaSO_4##

Calcium is a Group 2 metal; it tends to lose 2 electrons upon oxidation to form the ##Ca^(2+)## ion. Sulfate ion has a formula of ##SO_4^(2-)##. Formation of the binary salt, ##CaSO_4##, is thus electrically and chemically reasonable.

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