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29 May, 01:08

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

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  1. 29 May, 04:13
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    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.
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