dec 30, 1921 - Niels Bohr Born October 7 1885 in Denmark and died on November 16 1964 Bohr developed the Bohr model of the atom, in which he proposed that energy levels of electrons are discrete and that the electrons revolve in stable orbits around the atomic nucleus but can jump from one energy level (or orbit) to another.
Added to timeline:
Date:
dec 30, 1921
Now
~ 103 years ago