what are atom and molecule
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the universe is made up of atoms which contains electron proton Neutron
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An atom is a smallest particle of element which can take part in a reaction and is considered the basic unit of matter. Eg:- O, H, HCl are atoms.
A molecule is the smallest particle of a substance that can normally exist separately and retain the characteristics of the substance.
Eg:- O2, H2, Cl2 are molecules.
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