How can the number of atoms of an individual element be determined by usung a chemical formula?
The subscripts give the number of atoms of a particular atom.
is 1. There is a subscript of 2 next to the chlorine, so the number of chlorine atoms is 2.
If there is a polyatomic ion, it is necessary to multiply the subscript of the polyatomic ion by the subscript of atoms in the polyatomic ion.
To find the number of the individual atoms in a molecular formula look at the subscripts and pay attention to the math.