1926, Quantum Mechanical Model

Year: 1926
Chemist: Erwin Schrodinger
Contribution: Developed the Quantum Mechanical Model

Photo Credit: schuetteefasano.blogspot.com
In 1926 Erwin Schrodinger took the Bohr model one step further and hammered out a system to predict the probability of an atom being in a specific position. This particular model can pictured as a nucleus surrounded by an electron cloud, with the densest portions of the cloud indicating higher probability of an electron being present there.

Photo Credit: abcte.org
Information Credit: American Board for Certification of Teacher Excellence