How much atoms does a molecule have?

Answer 1

The number of atoms in the molecule of a compound depends on the stability factors and electron sharing which in turn depends on the valency of participating atoms. For Eg if a molecule of water is to be made, the participating atoms would be that of H and O. And since valency of O is 2(it has 6 electrons in valence shell, 2 less than the stable octet configuration) and that of H is 1, the molecule will consist of 2 H and 1 O atom that is 3 atoms,H2O. Similarly NH3 (1 Nitrogen and 4 hydrogen atoms) has 4 atoms, H2SO4 has 7 atoms and so on. The best way to find out the number of atoms in a molecule is to see its chemical formula