-
1913- Bohr atomic model
electrons could only occupy particular orbits determined by the quantum of action and that electromagnetic radiation from an atom occurred only when an electron jumped to a lower-energy orbit. -
1920s- Nobel prize
started building up the periodic table by adding electrons one after another to the atom according to his atomic model. -
1930-Built a cyclotron
Started work on a cyclotron after realizing theoretical physics went from studying an atom to its nucleus -
1933- evacuated Jewish scientists
When Hitler came to power, used his connections to get physicists out Germany and into America to continue work