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460
430 BC
-Greek philosopher.
-Though only a few fragments of his work survive, he was apparently the first to describe invisible "atoms" as the basis of all matter.
-His atoms — indestructible, indivisible, incompressible, uniform, and differing only in size, shape, and motion — anticipated with surprising accuracy those discovered by 20th-century scientists.
-For his amusement at human foibles, he has been called "the Laughing Philosopher." References: Wiki of the person/About.com -
Period: Feb 28, 1000 to
Old Dudes Time Line
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Period: Feb 28, 1000 to
Medieval Alchemy
Achievments:
•Medieval alchemists produced hydrochloric acid, nitric acid, potash and sodium carbonate.
•They were able to identify the elements arsenic, antimony, and bismuth.
•Through their experiments, medieval alchemists invented and developed laboratory devices and procedures that are, in modified form, still used today.
•The practice of alchemy laid the foundation for the development of chemistry as a scientific discipline. -
John Dalton
-John Dalton was an English chemist, meteorologist and physicist.
-He revived the ancient theory of atoms and prepared the first table of atomic weights, and announced his notions publicly in 1803. By the end of his life his atomic theory was widely accepted.
-Dalton suffered a minor stroke in 1837, and a second one in 1838 left him with a speech impediment.
-He is also remembered for his weather observations, which he began recording in 1787 using instruments he made himself. References: Wiki -
Henri Becquerel
-A French physicist, Nobel laureate, and the discoverer of radioactivity along with Marie Curie and Pierre Curie, for which all three won the 1903 Nobel Prize in Physics.
-In 1894, he became chief engineer in the Department of Bridges and Highways
In 1892, he became the third in his family to occupy 'the physics chair.'
- In 1908, the year of his death, Becquerel was elected Permanent Secretary of the Académie des Sciences. He died at the age of 55 in Le Croisic. Reference: Wiki/Nobel -
J.J Thompson
-British physicist and Nobel laureate.
-He is credited for the discovery of the electron and of isotopes, and the invention of the mass spectrometer.
-Thomson was awarded the 1906 Nobel Prize in Physics for the discovery of the electron and for his work on the conduction of electricity in gases.
He enrolled at Owens College, Manchester, in 1870, and in 1876 entered Trinity College, Cambridge as a minor scholar. References: Wiki of the person/nobelprize.org -
Marie and Pierre Currie (Ref Nobelprize.org)
-Marie Sklodowska, as she was called before marriage, was born in Warsaw in 1867.
-He was 35 years, eight years older than Marie, and an internationally known physicist, but an outsider in the French scientific community
-In 1903 he received the Nobel Prize in Physics with his wife, Maria Salomea Skłodowska-Curie, and Henri Becquerel, "in recognition of the extraordinary services they have rendered by their joint researches on the radiation phenomena discovered by Professor Henri Becquerel". -
Ernest Rutherford
-Rutherford performed his most famous work after he had moved to the U.K. in 1907 and was already a Nobel laureate. -In 1911, he postulated that atoms have their positive charge concentrated in a very small nucleus, and thereby pioneered the Rutherford model. References: Wiki of the person/textbook
- He is widely credited with first "splitting the atom" in 1917.
-The chemical element rutherfordium (element 104) was named for him in 1997. References: Wiki of the person/About.com -
Neils Bohr
-was a Danish physicist who made fundamental contributions to understanding atomic structure and quantum mechanics, for which he received the Nobel Prize in Physics in 1922.
-Bohr mentored and collaborated with many of the top physicists of the century at his institute in Copenhagen.
- He was part of a team of physicists working on the Manhattan Project.
-In 1916, Bohr became a professor at the University of Copenhagen. -
J.Chadwick
-was an English Nobel laureate in physics awarded for his discovery of the neutron.
Chadwick’s discovery made it possible to create elements heavier than uranium in the laboratory.
-Chadwick was born in Bollington, Cheshire to John Joseph Chadwick and Anne Mary Knowles.
-Chadwick became professor of physics at Liverpool University in 1935. Ref: Wiki/About.com
