all the mass of an atom is concentrated in the nucleus
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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. The positive charge in the nucleus is balanced by the negative electrons, making an atom neutral
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All the mass of an atom is concentrated in the nucleus because an atom consists of three subatomic particles such as electron, proton and neutron. The nucleus present at the centre of an atom usually contains two subatomic particles i.e. protons and neutrons. The total mass of a nucleus is the sum of the mass of protons and neutrons located at the central part of an atom.
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