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Democritus, 460-370 B.C., founder of Atomic Theory. He was born in Abdera.
This model is small, spherical, solid, and indivisible. -
Leucippus; Atomism, He lived in the 5th century B.C. in Ancient Greece.
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Aristotle, 384-322 B.C., Stagirus. Aristotle emphasized that the nature consists of four elements: air, Earth, fire, & water.
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Eratosthenes accurately calculates the diameter of Earth, ca. 300 B.C.
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The Chinese first produce paper, 160 B.C.
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Glass blowing is invented ca. 90 B.C.
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Black plague devastates Europe in 1340s
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Nicholas Copernicus; 1473-1543, Feb. 19, 1473 in Frauenburg, East Prussia. Astronomer who proposed that the planets have the Sun as the fixed point to which their motions are to be referred. Also proposed that the theory called The Heliocentric.
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Columbus sails in 1492.
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Galileo Galilei: February 15, 1565-1642 in Italy, he discovered, with the telescope, revolutionized astronomy and paved the way for the acceptance of the Copernican heliocentric system.
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Issac Newton: Born January 4, 1643-1727 in England, he was known for the Mathematical Principles of Natural Philosophy in 1687, often shortened to Principia Mathematica or "the Principia."
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Antione Baum was born February 26, 1728-1804, in Senlis, France. He was known for the invention of the Baume Scale Hydrometer and technical processes.
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Amedeo Avogadro: 1776-1856, August 9, in Turin. He was known for his theory of Molarity and molecular weight. He was also the first person to calculate the number of entities in atoms.
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John Dalton: September 6th, 1776-1844 in England. He created his own Atomic Theory.
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French Revolution in 1789.
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The university of Berlin is established in 1810.
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Napoleon's defeat at Waterloo in 1815.
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Wilhelm Conrad Rontgen: March 27th, 1845-1923, southern Rhine of Germany. He discovered x-ray in 1895.
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Henri Becquerel: 1852-1908; from Paris, France. He was famous for his experiments on connections between x-rays and a natural occurring phosphorescence.
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J.J. Thomson: December 18, 1856-1940, from Manchester, England. Awarded the Nobel Prize in Chemistry for his discovery of alpha particles, positively charged particles emitted from radioactive elements.
This model is the plum-pudding model. The nucleus was the pudding, while the plums where the electrons. -
Charles Darwin publishes Origin of Species in 1859.
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Marie Curie: September 7th, 1867-1908, from Warsaw, Poland. She found two new elements, polonium, and radium and how to separate them from non-radioactive substances; Nobel Prize in 1903.
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Robert Millikan: March 22nd, 1868-1953, from Illinois, America. He discovered that electrons negative charge; Nobel Prize in 1923.
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Ernest Rutherford; August 30th, 1871-1937 in New Zealand. He is credited with the concept of the nucleus and nuclear structure theory.
The planetary model had Electrons spiraling the nucleus. -
Erwin Schrodinger; August 12th, 1877-1961, in Vienna, Austria. He created the Electron Cloud Model.
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The first commercial telephone exchanged is made in New Haven, Connecticut during 1878.
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Niels Bohr: October 7, 1885-1962, Denmark. He was given the Nobel Prize in 1992 for great contribution to the understanding of atomic structure and quantum mechanics first Atomic Bomb.
Bohr's work combined with Rutherford's created the Rutherford-Bohr model. -
James Chadwick: October 20th, 1891-1974, England. He discovered the neutron in 1932.
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The U.S, gains control of Cuban, Puerto Rico, and the Philippines after the Spanish-American War in 1898.
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Werner Heisenberg: 1901-1976, December 5th, at Wurzburg, Germany. 1925, He devised a method to formulate quantum mechanics in terms of matrices, for which he was awarded the 1932 Nobel Prize for Physics.
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Gerhard Herzberg; December 25th, 1904-1999, Germany. In 1971 he won the Nobel Prize for atomic and molecular spectroscopy.
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Russia has a series of revolutions collectively called the Russian Revolution, which led to the Soviet Union, in 1905.
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Melvin Calvin; 1911-1997, April 8th, America. He discovered the Calvin Cycle and won the Nobel Prize in 1961.
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The Titanic sank from the 14th to the 15th in 1912.
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Election of 1912.
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Sir Derek Barton: 1918-1998, September 8, Britain. He won the Nobel Prize of Laureate for his contributions to the development of the concept of conformation and its application in chemistry.
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Owen Chamberlain; Born on July 10th, 1920-2006, American physicist. In 1955 Chamberlain discovered the anti-proton, a subatomic particle with the same mass as the proton but with a negative charge.
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Rosalind Franklin; 1920-1958, July 25th, contributes to the understanding of the fine structures of DNA, viruses, coal, and Graphite x-ray diffraction images of DNA, 1953.
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Robert Goddard makes the first flight of a liquid fueled rocket in 1926.
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Atomic Bomb is dropped on Hiroshima in 1945.
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Korean War begins in 1950.
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Hubble telescope is launched in 1990.
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World Trade Center is attacked in 2001.
