Explain different types of molecules with examples.

1. A molecule is a group of two or more atoms.
2. Molecules having two atoms are known as Diatomic molecules. An example is O₂.
3. Molecules having more than two atoms are called polyatomic molecules. An example is CO₂.
4. Molecules having three atoms in them are called triatomic molecules. An example is O₃.
5. Molecules having four atoms are called tetra atomic molecules. An example is P₄.