How are molecules different from atoms?

An atom has a nucleus surrounded by electrons. ... But when three oxygen atoms combine to form an O3 molecule, it becomes Ozone. So another difference between atoms and molecules is that when similar atoms combine together in varying numbers, molecules of different properties can be formed. read more

Molecules are agglomerations of two or more atoms(of the same or different elements). A molecule is the smallestparticle of a chemical compound. Molecules are formed by atoms in amultitude of different arrangements. read more

When atoms combine in different numbers to form a molecule, the end result can vary. For example, when two atoms of oxygen combine to form a molecule, it becomes O2 which is the oxygen we breathe in. But when three oxygen atoms combine to form an O3 molecule, it becomes Ozone. read more