Which particle in the atom has the smallest mass? electron proton neutron photon

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asked Jun 24, 2017 12.5k views

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Mohan Narayanaswamy · Answer 1 · 2017-06-30T12:12:28+0000

Electron by far. It has a mass of only 5.45 x10^-4 amu, while a protron and neutron both have masses about 1 amu.
And a photon has no mass, but is not a part of the atom.

Which particle in the atom has the smallest mass? electron proton neutron photon

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