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(How do we know that the atom ismade of protons, electrons...?)
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When was the nucleus discovered?
The nucleus was discovered in 1911 by Ernest Rutherford.
Steve Gagnon, Science Education Specialist (Other answers by Steve Gagnon)
If there is no way in the world to see an atom, then how do we know that the atom is made of protons, electrons, neutrons, the nucleus and the electron cloud?
All About Atoms
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