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dec 31, 1912 - Niels Bohr

Description:

Planetary Model
Electrons orbited the nucleus in fixed orbits of differing energy levels.
Positive - Stable electron orbits with emission spectra.
Negative - Doesn't work for heavier elements.

Added to timeline:

Atomic models throughout time

ByDylan Daou
3 May 2020

Date:

dec 31, 1912
Now
~ 111 years ago
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