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Why is the mass of proton less than the mass of neutron?

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Why is the mass of proton less than the mass of neutron?

Asked Vamak Singh

The standard values of masses of proton, neutron and electron are as given below.

Particle Charge Mass (g)
Proton +1 1.6727 x 10–24 g
Neutron 0 1.6750 x 10–24 g
Electron -1 9.110 x 10–28 g

proton-neutron

Please refer to http://physics.stackexchange.com/questions/34245/why-is-neutron-heavier-than-proton

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