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John Dalton formed the atomic theory with spherical solid atoms
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W.K Roentgen discovered X-rays while experimenting with cathode-ray tubes
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Henri Becquerel discovered radioactivity when he investigated uranium and other radioactive substances.
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The Curies discovered radium and polonium when they started to investigate radioactive substances
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J.J Thompson discovered the electron and developed the plum-pudding model of the atom.
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Albert Einstein developed the theory of relativity
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Robert Millikan found out the electric charge of the electron
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Ernest Rutherford used the results of his gold-foil experiment to state that all the mass of an atom were in a small positively-charged ball at the center of the atom.
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Neils Bohr developed the Quantum Theory of Matter
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Oppenheimer invented the atomic bomb