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In the year of 1913 N. Bohr discovered electrons are confined to certain energy levels (orbitals.) When electrons move from orbital to orbital they either absorb or release energy.

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In 1911 he made discoveries about radioactivity and nuclear physics. He stated that atoms are mostly empty space and electrons are randomly scattered around the nucleus.

The model he made was called The Gold Foil Expiriment

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In 1897 J.J Thomas discovered electrons and their electric charge with Cathode Ray tube experiments. He was the first to prove atoms were made up of smaller pieces

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In 1832 he brought back the idea of all matter being made up of extremely small particles, called atoms, and supported it with evidence.

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In 400 B.C. Democritus suggested all matter was made of small particles (atoms)