The mass of an atom may be determined by adding the masses of the protons and neutrons in the nucleus and then subtracting the mass defect. Why is it unnecessary to include the electrons when determining the mass of an atom?

Md Ariful Islam

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A proton has has about 1836 times more mass than an electron and neutrons are almost the same mass as protons.

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The number of protons is crucial in detemining the identity of the atom (or element). If the atom contains 2 protons, 2 positively charged nuclear particles, then $Z=2$, and the...

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Because of binding energy, the atomic mass of a nucleus compared to the sum of the masses of its individual nucleons (protons plus neutrons) is what?

The Atomic (more precisely, nuclear) mass of a nucleus is given by sum of the masses of the constituent particles, reduced by the binding energy divided by the square of...

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Describe Rutherford's model of the atom, including the location of protons, neutrons, and electrons with respect to the nucleus. How does this model explain the deflections of a beam of alpha particles aimed at a sheet of gold foil?

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