what is atom , nucleus , molicule
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Explanation:
At the center of an atom is a nucleus made up of two types of particles called protons and neutrons. Protons have a positive electrical charge. The number of protons in the nucleus determines what element the atom is. Neutrons are about the size of protons but have no charge.
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atom is the smallest particle of an matter.
Nucleus is the smallest sub atomic particle of an atom.
Molecule is a group of atom
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