Number of atoms in a molecule of element is called atomicity
- Some atoms are Monoatomic
They have 1 atom which exists independently
Example-Argon (Ar), Helium (He)
- Some atoms are Diatomic
They have 2 atoms chemically combined together
Example - Oxygen (O 2 ), Hydrogen(H 2 ), Nitrogen(N 2 ), Chlorine(Cl 2 )
- Some atoms are Tetra-atomic
They have 4 atoms chemically combined together
Example-Phosphorus(P
4
)
- Some atoms are Polyatomic
They have many atoms chemically combined together
Example- Sulphur(S 8 ) has 8 atoms chemically combined together
