dec 17, 1926 - Erwin Schrodinger used math to theoretically find an electron in an atom
Description:
 Erwin Schrodinger was an austrian physicist. He was born 1887 and died 1961. He took Bohr's model of the atom a step further and used math to theoretically predicted where the electron is in the atom. This is known as the quantum atom model. 
Added to timeline:
Date: