Abbie's atomic timeline :)

Democritus

212

Existed in 500 B.C.
All matter consists of extrmely small particles that couldn't be divided. He used discourse to conclude his thoughts.

Aristotle

Mar 3, 1417

About 500 B.C.
Aristotle beieved there was no limit to the number of times matter could be divided. He used discourse to process his theory.

Isaac Newton

Mar 3, 1704

Newton proposed that we live in a mechanical universe with small solid masses in constant motion.

John Dalton

Mar 3, 1776

Dalton studied gas behaivior in the air. Based on gases exert pressure he proposed that all matter is made up of individual particles called atoms, which cannot be divided.

J.J. Thomson

Mar 3, 1897

J.J. Thomson hypothesized that atoms are made of even smaller particles. To reach his discovery he experimented with 2 tubes of glass in A: when the current was on, the disks became charged and a glowing beam appeared in the tube, B: The beam bent toward a positively charged plate placed outside the tube.

Hantaro Nagaoka

Mar 3, 1904

He made 2 predictions: That atoms have a very massive nucleus and that electrons revolve around the nucleus, bound by electrostatic forces. He created a planetary model about Saturn and its ring. He used other peoples ideas and sculpted his own from that.

Ernest Marsden

Mar 3, 1909

Marsden was one of Rutherfords students, who helped him to find out what happens to alpha particles when they pass through a thin sheet of gold.

Ernest Rutherford

Mar 3, 1911

Ernest Rutherford states his atoms have a central positive nucleus surrounded by negative orbiting electrons. After doing his famous gold foil experiment in which he fired radioactive particles through thin metal.

Niels Bohr

Mar 3, 1913

He proposes the electrons move in spherical orbits at fixed distances from the nucleus.

Louis de Broglie

Mar 3, 1924

Broglie said that when particles move they create a sort of wave. It takes him a few years after he says this to collect supporting data.

Erwin Schrodinger

Mar 3, 1926

Schrodinger tried to determine the motions in which electrons travel in, he created mathmatical equations to do so.

Werner Heisenberg

Mar 3, 1927

Werner was the founder of the Principle of Indeterminancy, which states you can not know both the position and velocity of a particle.

James Chadwick

Mar 3, 1932

Chadwick was a British physicist, who confirmed the existence of neutrons. Atomic nuclei contain neutrons and positive charged protons.