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Sep 25, 1000
Democritus
(Greek) 460BC - 370BC He was also known as the “Laughing Philosopher", because he mocked fellow citizens for their follies. Atoms did not make up just everyday objects for Democritus, but influenced his thoughts on sight, senses and souls. -
John Dalton
(English) 1766-1844 He is best known for his pioneering work in the development of modern atomic theory, and his research into color blindness. As a result of his contributions to the understanding of color blindness, the condition is still often referred to as "Daltonism." -
J.J. Thomson
(British) 1856-1940 He was a physicist. He showed that cathode rays were composed of a previously unknown negatively charged particles. -
Robert Millikan
(American) 1868-1953 He’s an American experimental physicist honored with the Nobel Prize for Physics in 1923 for his measurement of the elementary electronic charge and for his work on the photoelectric effect. Millikan was an enthusiastic tennis player, and golf was also one of his recreations. -
Ernest Rutherford
(New Zealand) 1871-1937 He was a physicist and chemist who became known as the father of nuclear physics. Ernest Rutherford is one of the most illustrious scientists of all time. -
Albert Einstein
(Germany) 1879-1955 E=mc2. -
Niels Bohr
(Danish) 1885-1962 Recognition of his work on the structure of atoms came with the award of the Nobel Prize for 1922. Niels Bohr was President of the Royal Danish Academy of Sciences, of the Danish Cancer Committee, and Chairman of the Danish Atomic Energy Commission. -
Erwin Schrödinger
(Austrian) 1887-1961 He was a physicist who developed a number of fundamental results in the field of the quantum theory. his dissatisfaction with the quantum condition in Bohr's orbit theory and his belief that atomic spectra should really be determined by some kind of eigenvalue problem. For this work he shared with Dirac the Nobel Prize for 1933. -
James Chadwick
(English) 1891-1974 He was a physics for his discovery of the neutron in 1932. He was the head of the British scientists who worked on the Manhattan Project during World War II. -
Louis de Broglie
(France) 1892-1987 He is the author of more than twenty-five books on the fields of his particular interests. He was elected a member of the Academy of Sciences of the French Institute in 1933, Louis de Broglie has been its Permanent Secretary for the mathematical sciences since 1942. -
Werner Heisenberg
(German) 1901-1976 He was a theoretical physicist and one of the key creators of quantum mechanics. Later Heisenberg stated his famous principle of uncertainty. His hobby was classical music. -
The Atomic Theory
1 All matter is composed of a very large number of very small particles called atoms.
2 For a given element, all atoms are identical in all respects. In particular all atoms of the same element have the same constant mass, while atoms of different elements have different masses.
3 The atoms are the units of chemical changes. Chemical reactions involve the combination, separation, or rearrangement of atoms, but atoms are neither created, destroyed, divided into parts. -
Work Cited
(n.d.). Retrieved from http://www.egs.edu/library/democritus/biography/ Sydney, R. (n.d.). Retrieved from http://www.biography.com/people/john-dalton-9265201 The Nobel Prize (n.d.). Retrieved from http://www.nobelprize.org/nobel_prizes/physics/laureates/1906/thomson-bio.html (n.d.). Retrieved from http://www.nobelprize.org/nobel_prizes/physics/laureates/1923/millikan-bio.html
