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In the atom:

Neutron:

Mass: 1,00866491600(43) amu.

Charge: neutral

James Chadwick, 1932

Electron:

Mass: 5,4857990946(22)×10−4 amu.

Charge: negative

J. J. Thomson, 1897

Proton:

Mass: 1,007276466812(90) amu.

Charge: positive

Ernest Rutheford, 1919

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