## Chemistry: Molecular Approach (4th Edition)

a) In the formula, we can see that there are 3 atoms of Mg, 2 atoms of $P$ (1x2), and 8 atoms of $O$ (4x2) b) In the formula, we can see that there is 1 atom of Ba and 2 atoms of $Cl$ c) In the formula, we can see that there is 1 atom of Fe, 2 atoms of $N$ (1x2), and 4 atoms of $O$ (2x2) d) In the formula, we can see that there is 1 atom of Ca, 2 atoms of $O$ (1x2), and 2 atoms of $H$ (1x2)