Famous Dead Guys Harrison Higgs

Demcritus 429 BC

101

Year- 429 BC
Main Contribution-thought that all things are made up of atoms

Aristotle 400 BC

102

Year- 400 BC
Contribution-determined that all things were made up of earth, wind, fire, and air.

Sir Issac Newton

Oct 1, 1704

Contribution-thought everything was made up of atoms

John Dalton

Oct 1, 1766

Contribution-all matter made of atoms, and that it can not be made nor destoryed
Thought of four ideas different atoms, reactions when rearranged compound, all matter made of atoms cannot be made nor destoryed element atoms are the same.

Henri Becquerel

Oct 1, 1896

Contribution- helped discover radioactivity

Joseph john Thomson

Oct 1, 1897

Contribution-found electrons via Cathode Ray Tube thought up the Plum pudding Model

Robert Millikan

Oct 1, 1908

Contribution-measured the charge and mass of the electron

Ernest Rutherford

Oct 1, 1911

Contribution-central positive nucleus surrounded by negative orbiting electrons

Niels Bohr

Oct 1, 1913

Contribution-depicted atom as small positively charged nucleus surrounded by electrons moved in circular motion. made the Bohr Model

Francis Aston

Oct 1, 1920

Contribution-discovered isotopes of non-radioactive elements

Erwin Schrodger

Oct 1, 1926

Contribution-found that consists of nucleus and shells. Proved Bohr Model incorrect. Created formula for finding where electrons are.

James Chadwick

Oct 1, 1932

Contribution-discovered the neutron