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400
Demcritus
Democritus was one of the first greek philosophers to devolop an atomist theory of the universe. -
Period: 400 to
Atomic Theory Time Line
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Antoine Lavoisier
Antoine was a french vhemist and he made up the Law of conservation of Mass and named oxygen and hydrogen -
Law of conservation of Mass
The Law of Conservation of Mass was created by Antoine in 1789 and it states that mass can't be created or destroyed. -
John Dalton
John Dalton discovered the existence of atoms and found the first 6. -
Dalton's Atomic theory
Dalton's Atomic theory states that matter is made up of tiny atoms. 2nd he stated that all atoms of a given element are identical and compounds are fomed by a combination of two or more elements. -
Dmitri Mendeleev
Dmitri was a Russian chemist who discovered the peroiodic law and developed the periodic table. -
J.J. Thomson
J.J. Thomson, a British physicist, discovered the electron and how it had a negative charge. -
Cathode Ray Tube
This Cathode Ray Tube was inverted by J.J. Thomson and this tub is a vacuum tube containing an electron gun and a florescent screen used to view images. -
Plum Puddin Model
The plum pudding was created by J.J. thomson. He created it to probe the atom. he thought the electrons were like little raisins. The atom was like a plum pudding with a positive charge (1+) and mass spread all around like pudding. -
Gold Foil Experiment
The Gold Foil Experiment was created by Rutherford and it showed how particles with a 2+ charge interacts with a piece of very thin piece of gold foil. -
Robert Millikan
Robert Millikan was an American physicist and he discovered the measurment of an electron on tiny falling water. -
Rutherford's Model
Rutherford was a british physicist who created the ruthford model and it showed the atom made up of a central charge surrounded by a cloud orbiting electrons. -
Ernest Rutherford
Ernest Rutherford discovered the nuclues. -
Electron Cloud Model
The electron cloud model was invented by Erwin Schrodinger. The cloud model represents a history of where the electron has probably been and where it's likely to be. -
Henry Moseley
Henry Moseley was an English physicist. He used an x-ray spectrums to determine atomic numbers -
Bohr Planetary Model
The Bohr Planetary model isa model showing an atom consisting of a small, positively-dharged nucleus orbited by a negatively-charged electrons. Niels Bohr created it. -
Niels Bohr
Niels Bohr was a Danish physicist. He discovered the structure of the atom and how the electrons travel in an orbit around the atom's nucleus. -
Erwin Schrodinger
Erwin Schrodinger was an Austrian physicist who developed a number of fundamental results in the field of quantum theory, which formed the basis of wave machanics. He formulated the wave equation and revealed the identity of his development. -
Quantum Mechanical Model
The Quantum Mechanical Model was invented in 1926. It was mainly based on mathematics and the Quantum Theory which states that matter also has porperties associated with waves. It helps explain observations made on complex atom. -
James Chadwick
James chadwick was an English phycisist. he discovered the neutorn. He discovered this by understanding the nulclear fission of uranium.
