Molecule

• A molecule is in general a group of two or more atoms that are chemically bonded together.
• A molecule can be defined as the smallest particle of an element or a compound that is capable of an independent existence and show all the properties of that substance.
• Atoms of the same elements join together to form molecules then it is called homo molecules. Ex-H₂, and O_2.
• Atoms of the different elements join together to form molecules then it is called hetero molecules. Ex- H₂O, SO₂

Monoatomic:

When molecule consisting of only one atom then it is called monoatomic.

Ex- Argon(Ar) , Helium(He)

Diatomic:

A molecule which contains two atoms then it is called diatomic.

Ex- H_2, O_2.

Triatomic:

A molecule which contain three atoms then it is called triatomic.

Ex- Phosphorus (P₃)

Polyatomic:

A molecule which contain four atoms then it is called polyatomic.

Ex- Sulphur(S₄)