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Atomic Theory Timeline

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Melake Abebaw

on 28 September 2015

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Transcript of Atomic Theory Timeline

By Melake A.
Atomic Theory Timeline
His main contribution to science was discovering Electrons. He used cathode ray tube. Thomson suggested the model of an atom as a sphere.
Joseph John Thomson (Dec/18/1856-Aug/30/1940)
Manchester, England
He proposed a model of an atom. The model described the atom as a tiny, dense, positively charged core called a nucleus, in which nearly all the mass is concentrated, around which the light, negative constituents, called electrons, circulate at some distance, much like planets revolving around the Sun.
Ernst Rutherford (Aug/30/1871-Oct/19/1937)
New Zealand
His atomic theory said that all the atoms that make up the element have the same mass. All elements are different from each other due to differing masses.
John Dalton (Sep / 6/ 1766- Jul/27/1844
His theory was that everything is composed of "atoms", that atoms are indestructible, there are an infinite number of atoms, and kinds of atoms. Atoms are solid but invisible. Atoms are homogenous.
His mentor, Leucippie, originally came up with the idea but it was then adopted by Democritus.
Democritus (460-370BC)
Fun fact;
When Dalton died
40 000 people
attended his funeral

Niels Bohr ( Oct/7/1885-Nov/18/1962)
Copenhagen, Denmark
He passed on to a study of structure of atoms on the basis of Rutherford's discovery of nucleus
He is known for his quantum theory
He introduced the atomic hydrogen atom.
Sir William Crookes
(June/17/1832-Apr/4/1919) London, England
Responsible for reconstructing the cathode ray, discovered the element thallium and show there is a negative charge in atoms.
James Chadwick (1891-1974)
Discovered the neutron in 1932. This discovery led directly to the discovery of fission and ultimately to the atomic bomb. Collaborator of Rutherford's.
Robert Millikan (1868-1953)
Determined the unit charge of the electron in 1909 with his oil drop experiment at the University of Chicago.
Aristotle(384-322BC)
He believed in the four elements of air, earth, water and fire.
Aristotle felt that regardless of the number of times you cut a form of matter in half, you would always have a smaller piece of that matter.
Aristotle was the tutor of Alexander the Great.
Louis de Broglie (1892-1987) Dieppe, France
His ideas were a basis for developing the wave mechanics theory. It has helped improve our knowledge of the physical nature on the atomic scale.
He discovered that electrons can act like waves.
Michael Faraday (1791-1867)

Splitting of molecules with electricity , developed laws of electrolysis
He was not a proponent of atomism.
Realized the importance of electric force at a young age.
James Clerk Maxwell
(1831-1879)
His contribution to the atomic concept had to do with his theory of electromagnetism.
He did multiple demonstrations one begin the connection between two forces which unexpectedly involved the velocity lof light.
Julius Plucker (1801-1868)
He was the first person to discover Cathode rays.
He essentially demonstrated that analytical geometry was capable of replicating the results of pure geometry.
Citation
The History of Atom.wikispace
Google.com
Chemistryexplained.com
britannica.com
chemheritage.com
Erwin Schrodinger (1887-1961)

Erwin Schrodinger introduced the mathematical equation of wave mechanics that is still the most widely used piece of mathematics.
George Johnston Stoney
(1826-1911)
From his work on molecular physics kinetic theory of gases, he estimated the number of molecules in a volume of gas under standard condition.
He also proposed explanations for for the escape of hydrogen and helium from earth's gravity.
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