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1. Proton: a particle from the atomic nucleus, positive charge, mass approx. 1 u.a.; discovered by Ernest Rutherford in 1919.

2. Neutron: a particle from the atomic nucleus, neutral, mass approx. 1 u.a.; discovered by James Chadwick in 1932.

3. Electron: a particle from the atom, negative charge, very low mass; discovered by

J. J. Thomson in 1932.

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12y ago

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