Molecules

Most atoms do not exist their own,but bond with other atoms-either ones of their own type or of another element-to from molecules.atoms join together by sharing their electrons,a process known as chemical bonding.

Simple molecules

The natural state of oxygen is nearly always as a molecule is made up of two oxygen atoms,chemically bonded together.The oxygen in the air consists of molecules,not single atoms.

Complex molecules

A sulfur molecule is made up of eight sulphur atoms bonded together in a ring.The structure of a molecule can be shown by a formula.For example,sulphur has the chemical symbol S and is made up of eight atoms ,so its chemical formula is S₈

Different arrangement

Atoms of some element can join  together in different ways to create different substance .For in example,carbon atoms can join together in sheets to from graphite or in a lattice shape to from diamond

Complex chains

Some molecules are simple,containing just a few atoms.Others are very complex and may have hundreds or even thousands of atoms joined together in long chain like structures ,such as those in a vitamin a molecule.