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jun 1, 1917 - Discovery of Electron Shells: In 1917 Niels Boer suggested that electrons must orbit the nucleus at set distances in fixed energy levels/shells. He suggested this because when heated, light with a certain amount of energy was given out. Energy is given out when electrons fall from higher to lower shells.

Added to timeline:

2 months ago
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Discovery of Particles

Date:

jun 1, 1917
Now
~ 101 years ago

Images:

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