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- smallest unit of matter.
-smallest particle of an element that can enter into a chemical reaction.

Atoms can either be protons, electrons, and/or neutrons.
Molecules are two or more atoms chemically combined.
Ions: charged particles.

Hope that helped.
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Atoms are the smallest particles in matter and they have 3 sub atomic particles namely protons, neutrons and electron. Protons are the sub-atomic particles which has the positive charge, neutron is the sub-atomic particle which has no charge or neutral and the electron which has the negative charge. 
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