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John Daltons’s theory said that elements were made of small particles called atoms which were indivisible.

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J.J Thompson’s findings said that atoms contain tiny negatively charged subatomic particles which he called electrons and made a model of an atom.

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Ernest Rutherford found that atoms were mostly empty space, and the majority of its mass was concentrated on a tiny nucleus.

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Niels Bohr, a Danish physicist discovered that Electrons orbit the nucleus and that the energy of electrons quantized.

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Erwin Schrodinger took Boer’s model and used mathematical equations to describe the likelihood of finding an electron in a certain position.