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MONO ATOMIC MOLECULE- Molecules made up of one atom is called as Mono atomic molecule.  .eg. argon.

DI ATOMIC MOLECULES- Molecules made up of two atoms is called as Di atomic molecule. eg. hydrogen.

POLY ATOMIC MOLECULE-  Molecules made up of four or more atoms is called Poly atomic molecule. eg. carbon di oxide.

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Mono means an atoms with only one bonding atom,di means two ,poly means three or more than three.