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Gypsum is the commerical/everyday name for calcium sulphate, di-hydrate (CaSO4.2H2O)
The calcium sulphate molecule contains the following atoms ;-
1 x calcium
1 x sulphur
4 x oxygen.
Discount the di-hydrate.
Calcium contains 20 protons and 20 electrons
Sulphur contains 18 protons and 18 electrons
oxygen contains 8 protons and 8 electrons
4 x oxygen contains 32 protons and 32 electrons.
So overall one molecule of gypsum contains 20 + 18 + 32 = 70 protons and 70 electrons.
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