oct 19, 1913 - Bohr Planetary Model:
Created by Niels Bohr;
Depicts the atom as a small, positively charged nucleus surrounded by electrons that travel in circular orbits around the nucleus;
Electrons orbit the nucleus in orbits that have a set size and energy;
The energy of the orbit is related to its size. The lowest energy is found in the smallest orbit;
Radiation is absorbed or emitted when an electron moves from one orbit to another