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atoms are the smallest particle of a substance which takes part in chemical reaction.the subatomic particles are electrons , neutrons , protons and nucleus.
the nucleus consists of protons and neutrons.protons have positive electrical charge and neutrons have no charge.
electrons revolve around the nucleus in fixed orbits.electrons have negative electrical charge.
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Atoms are the smallest particle of an element which is composed of nucleus that consist of neutron and proton.
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