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• Electron was not significantly measured since its mass is quite very small that it can affect the properties of the atom.

• Both protons and neutrons are located in the nucleus of an atom. Protons carries positive charged while neutron carries no charged. Electron is located outside the nucleus of an atom and it carries negative charged. The most important electron is the valence electron and the basis of naming the element is the number of protons.

Mass number

The total number of Protons plus the total number of Neutrons.

Both Protons and Neutrons have significant value in terms of mass of the atom. If the mass number is 4, then the atomic mass unit of that atom is 4 amu.

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