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Democritus
Democritus was an Ancient Greek philosopher born in Abdera, Thrace, Greece. He was a philosopher and student who formulated an atomic theory for the universe. Born 460 B.C Died 370 B.C -
Antoine Lavoisier
He was known as the father of chemistry. Lavoisier demonstrated the role of oxygen in the rusting of metal, as well as oxygen's role in animal and plant respiration. -
John Dalton
Dalton's theory was based on the thought that the atoms of different elements could be distinguished by differences in their weights.
He thought that thw structure of compounds can be shown in whole number ratios.
Died July 27, 1844 -
J.J. Thomson
Thomson conduted a cathode ray tube experiment to find that the model of the atom as a sphere of positive matter in which electrons are positioned by electrostatic forces. He was trying to calculate the number of electrons.
Died: August 30, 1940 -
Robert Millikan
He was the coauthor of a series of introductory textbooks. which were ahead of their time in many ways. Compared to other books of the time, they treated the subject more in the way in which it was thought about by physicists. -
Niels Bohr
Niels Henrik David Bohr was a Danish physicist who made foundational contributions to understanding atomic structure and quantum mechanics, for which he received the Nobel Prize in Physics in 1922. -
Erwin Schrodinger
He was an Austrian physicist who developed a number of fundamental results in the field of quantum theory. He was responsible for the quantum theory. -
James Chadwick
In 1932, while working under Ernest Rutherford at Cambridge, James Chadwick proved the existence of neutrons, the elementary particle. He was an English Nobel laureate in physics awarded for his discovery of the neutron. -
Cathode Ray Tube
The cathode ray tube is a vacuum tube containing an electron gun and a fluorescent screen used to view images. CRT's were used in tv's and Computer monitors. -
Gold Foil Experiment
The Gold Foil Experiment model was developed in 1904 by J.J. Thompson, the scientist who discovered the electron. This stated held that the negatively charged electrons in an atom were floating in a space of positive charged electrins -
Bohr Planetary Model
A theory of atomic structure that explains the spectrum of hydrogen atoms. It assumes that the electron orbiting around the nucleus can exist only in certain energy states. -
Plum Pudding Atomic Model
The plum pudding model of the atom by J. J. Thomson, who discovered the electron in 1897. In this model, the electrons were free to rotate within the blob or cloud of positive substance.
