given reasons, all the mass of atom is concentrated in the nucleus.
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Most of the mass of the atom is concentrated in the nucleus, which has a positive charge. Atom is made of central nucleus with electrons around the outside. Electrons have very little negative charge and mass. Most atomic masses are concentrated in the nucleus, which has a positive charge
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electrons are very lighter than protons and neutrons.
therefore the atomic mass is the sum of protons and neutrons only which are present in the nucleus.
That's y all the mass is concentrated in the nucleus.
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