Since the nucleus houses the neutron and the proton, it then follows that the nucleus is the point where most of the mass of the atom is concentrated.
The nucleus is composed of protons and neutrons. We know that the mass of the proton is 1640 times the mass of the electron. The neutron only contributes to the mass of the atom.
Since the nucleus houses the neutron and the proton, it then follows that the nucleus is the point where most of the mass of the atom is concentrated.
The electron has a negligible mass therefore, the electron does not contribute to the mass of the atom.
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