41
/
AIzaSyB4mHJ5NPEv-XzF7P6NDYXjlkCWaeKw5bc
May 31, 2026
1751942
142183
2
Public Timelines
FAQ

mar 21, 1922 - Neils Bohr

Description:

He was the first to discover that electrons travel in separate orbits around the nucleus. He also discovered that the number of electrons in the outer orbit determines the properties of an element.

Added to timeline:

27 Sep 2018
0
0
426

Date:

mar 21, 1922
Now
~ 104 years ago