-
460
Democritus
Born on 460 B.C. He was a Greek philosopher who made a mental model of the atom. -
Antoine Lavoisier
He developed a theory of chemical reactivity of oxygen. Also co-authored the system for naming chemicals. -
Joseph Louis Proust
He came up with the law of definite proportions 1793. Proved that the relative quantities of any compound's constituent elements remain constant. -
John Dalton
He was the first scientist to explain the behavior of atoms in terms of the measurement of weight. Dalton formed the atomic theory model of the atom and he was also an English schoolteacher. -
Michael Faraday
In 1832 he split molecules with electricity, which developed the laws of electrolysis. -
Solid Sphere Model
Proposed by John Dalton in 1803. -
Henri Becquerel
In 1896 his greatest discovery was made; radioactivity. He came upon the evidence nearly by accident! -
J.J. Thomson
His research led him to discover the electron with a cathode ray tube. Thomson also proposed the "plum-pudding" model of the atom. -
Max Planck
1900- used the idea of quanta to explain hot glowing matter. Quanta is discrete units of energy. -
Pierre Curie
He and his wife Marie discovered polonium and radium. -
Marie Curie
In 1898, her and her husband Pierre discovered polonium and radium. After Pierre died, the development of X-rays. -
Robert Millikan
He measured the charge of an electron, by the oil drop experiment. -
Ernest Rutherford
He was the first to split the atom. Rutherford also discovered the nucleus and created the gold foil experiment. -
Lisa Meitner
It was 1938 when Meitner verified that heavy elements capture neutrons and form unstable products. -
Otto Hahn
In 1938, Hahn and Fritz Strassmann discovered nuclear fission. -
Albert Einstein
Einstein created the theory of relativity. He also published the famous equation E=mc 2 -
Niels Bohr
Bohr developed the model of the atom in which electrons orbit the nucleus in energy levels. He did this with the planetorium model. -
Erwin Schrodinger
In 1926 he wrote the wave equation. This was a thougth that electrons moved like wave mechanics. -
James Chadwick
He discovered the neutron in 1932. -
Louis DeBroglie
He had discovered that electrons had a dual nature, they were similar to both particles and waves. -
Plum Pudding Model
This model was used by J.J. Thomson and he discovered the electron. -
Glen T. Seaborg
In 1941-1951 he synthesized six transuranium elements. Also he suggested a change in the periodic table. -
Planetary Model
Bohr used this to discover that electrons are in energy levels around the nucleus. -
Electron Cloud Model
Schrodinger had used this type of model. -
Quantum Mechanical Model
The current model of the atom; proposed by Schrodinger. -
Aristotle
Born on 384 B.C. He was the author of scientific system that became framework/vehicle for Christian Scholasticism.
