Famous Dead Guy Project

Thales of Miletus 620 BC

100

First Person to investigate the atom.

Democritus 440 BC

200

"Cutting the Cheese"
1st Atomic Theory
Came up with the word "atom"

Aristotle 340 BC

300

Did not believe in atomic theory.
More people believe him than Democritus.

Sir Issac Newton 1704

Oct 4, 1704

"Matter is made up of atoms"
Atoms are held together by forces.

John Dalton 1803

Oct 4, 1803

Atomic Theory Experiment
1. All matter is made up of atoms.
2. Atoms of a given element are alike, but different than atoms of different elements.
3.Different atoms combined make compounds.
4.A chemical reaction involves a rearragement of atoms.

Henri Becquerel 1896

Oct 4, 1896

Discovered Radioactivity.

J.J. Thompson 1897

Oct 4, 1897

Cathode Ray Model
Discovered the electron.

Robert Milliken 1908

Oct 4, 1908

Oil Drip Experiment.
Found charge of individual electrons.

Earnest Rutherford 1911

Oct 4, 1911

Gold Foil Experiment
Atoms is mostly empty space.
Discovered nucleus and protons.

Earnest Rutherford 1911

Oct 4, 1911

Gold Foil Experiment
Atom is mostly empty space.
Discovered nucleus and proton.

Gold Foil Experiment 1911

Oct 4, 1911

Rutherford fired particles through a thin gold sheet into a zinc sulfide sheet.
Particles hitting the nucleus were deflected.

Niels Bohr 1913

Oct 4, 1913

Theory on electrons.
Disceovered that electrons have paths.

Francis Aston 1919

Oct 4, 1919

Invented Mass Spectograph.
Discovered isotopes.

Francis Aston 1919

Oct 4, 1919

Invented Spectograph.
Discovered isotopes

Erwin Schrodinger 1926

Oct 4, 1926

Took the Bohr atom one step further.
Used math equations to find the probability an electron would be in a certain position.
Quantum Mechanical Model of the atom .

James Chadwick 1932

Oct 4, 1932

Discovered Neutron
Atomic Planetary Model