what is nucleus of an atom? compare its size with that of the atom.. name its constituents.. how was the number of this constituents determined by atomic number and mass number of the atom?
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The mass of an electron is very small compared to a proton or a neutron. Since the nucleus contains protons and neutrons, most of the mass of an atom is concentrated in its nucleus. Protons and electrons have electrical charges that are equal and opposite.
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