History of the Atom

Democtritus First Atom Theoroy

440

He proposed that everything in life was built out of something more than just the simply that material. Everything was made up of small building blocks of life called atoms

Dalton's Contribution to Atomic Theroy

Sep 22, 1802

Dalton Developed the Algorithm that calculated the weight of an atom.

Thompson

Nov 21, 1897

He discovered that electrons were the small particles on the outside of a cell had a negative charge.

Erwin Schrödinger

Oct 11, 1910

Schrödinger used mathematical equations to describe the likelihood of finding an electron in a certain position.

Bohr

Nov 21, 1922

He proposed that electrons orbit around the nucleus and that the amount of energy the electrons had by determining how far it was from the nucleus.

Broglie Made his Wave Electron Discovery

Jan 1, 1924

He believed that electrons acted like both particles and light waves so he could infer some of the properties.

Heisenberg

Dec 25, 1931

He discovered that electrons did not flow around the nucleus in neat orbits that it was unpredictable or random.