why all the mass of the atom is present inside the atom.
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The atom is made from a central nucleus with electrons around the outside. The electrons have a negative charge and very little mass. Most of the mass of the atom is concentrated in the nucleus, which has a positive charge.
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Atoms have most of their mass in the nucleus not only because protons and neutrons are heavier than electrons, but also because together, protons and neutrons outnumber electrons by roughly..
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