1900, Planck's Constant and Quanta

Photo Credit: timelineoftheatom.blogspot.com
Year: 1900
Chemist: Max Planck
Contribution: Planck's Constant and the Discovery of Quanta

Max Planck is most known for his quantum theory. It was his theory that energy does not come in waves but "packets," which he named quanta. With his discoveries he developed Planck's constant, which is a constant that can be used to describe particles' behavior at the atomic level.

Because of this constant Albert Einstein was able to describe similar properties with light, and even later Niels Bohr was able to use the theories to design his Bohr model.

Information Credits: Florida State University, Atomic Structure Timeline