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jan 1, 1993 - Niels Bohr

Description:

Bohr was the first to discover that electrons travel in separate orbits around the nucleus and that the number of electrons in the outer orbit determines the properties of an element

Added to timeline:

ANDREW FIRMSTONE

ByAndrew Firmstone
11 Oct 2017
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Date:

jan 1, 1993
Now
~ 33 years ago
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