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aug 4, 1913 - Bohr, Improved on Rutherford's model - proposed that electrons move around the nucleus in specific layers, or shells. Every atom has a specific number of electron shells.
Added to timeline:
History of Atomic Theory
By
Spencer Vess
1 Nov 2018
1
0
359
Date:
aug 4, 1913
Now
~ 112 years ago
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