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John Dalton pictures atoms as tiny, indestructible particles, with no internal structure.
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J.J. Thomson, a British scientist, discovers the electron. Then later leads to his "plum-pudding model". He pictures electrons embedded in a sphere of positive electrical charge.
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Hantaro Nagaoka, A Japanese physicist, suggests that an atom has a central nucleus. Electrons move in orbits like rings around then sun.
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New Zealand physicist Ernest Rutherford finds that an atom has a small, dense, positively charged nucleus. Electrons move around the nucleus.
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Niels Bohr changed Rutherford's model to include newer discoveries about how the energy of an atom changes when it absorbs or emits light.
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