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To work this out you need to know the atomic weight of calcium and Avogadros number, which is the number of atoms in a gram atom.

Calcium has an atomic weight of 40.078. Therefore a gram ato is 40.078 grams which contains 6.02214129(27)×1023 atoms.

1g of calcium contains 6.02214129(27)×1023 / 40.078

1.502 X 1022

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