ATOMS
An atoms is the smallest and basic unit of a chemical element or compound.
Example: Na, Li, Ne
MOLECULE
A unit consist of two or more atoms that are chemically bonded together
- Diatomic Molecules : Cl2 , F2, HCl
- Polyatomic Molecules : H2O, CO2
ELEMENT
A substance that cannot be separated into simpler substance by chemical means. Element consists of only one kind of atom and can exist as atom or molecules. For example Na and Li.
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