A molecule is a particle made up of two or more atoms that are chemically bonded together; the number of atomic nuclei making up a molecule is a determinate number. For example, HCl(g) is a molecule made of one hydrogen atom bonded to one chlorine atom. H2O (water), N2 (nitrogen),O3 (ozone), CaO (calcium oxide),CO2 (carbon dioxide) C6H12O6,(glucose, a type of sugar), , NaCl (table salt) Hemoglobin (C738H1166N812O203_S2Fe)
