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what is the difference between atom and molecule?

An atom is the smallest unit of an element. A molecule is two or more atoms chemically bonded together.

A molecule can be broken apart by chemical process, an atom cannot.

An atom is a single element. A molecule may or may not consist of a single element.
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Atom is smallest unit which consist of proton, neutron and surrounded by electron. No of proton is always equal to no of electron and thus atom is no charge. 

Molecule is combination of atoms with bond. Molecule is created by bonded atoms when electrons fill up the outer orbit of each atom. 

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Atom is the smallest unit of a substance which may or may not have an independent existence but takes part in a chemical reaction.
Molecule is the smallest particle of a substance which always takes part in a chemical reaction and can retain the chemical and physical properties of that substance.

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