Consider the chemical formula for calcium chlorate: Ca (ClO3) 2

How many of each of these atoms are in a molecule of calcium chlorate?

Ca:

Cl:

O:

The chemical formula of calcium chlorate is Ca (ClO3) 2, which means in this molecule, Ca2 + ion is bonded to two ClO3 - ions. So the formula can be expended to O3Cl-Ca-ClO3, or CaCl2O6 (basically times the numbers of the elements inside the bracket by the number outside the bracket.

Therefore, in a molecule of calcium chlorate, there are 1 Ca, 2 Cl, and 6 O.