Fall.2008.MMA.Hoy.Timeline


 * Ancient Greek and Roman Philosophers **

Democritus (460BC-370BC) . Socrates (469BC-399BC)
 * Born in the city of Abdera in Thrace
 * He was the first on record to say that there are many elements that can be aranged in many different ways.
 * Which would then turn into the basic table of the elements

Aristotle (384BC-322BC)
 * Born Greece
 * Socrates is mostly know for his philosophy. He is credited as being one of the first to contmeplate the theory of all things being made up of something smaller in nature and combining to make all living and non living things.


 * Born Stageira, Chalcidice
 * Is best known for his study of what is now known as the classical elements. His elements include Fire, Earth,Water and Air. He thought that these substances made up all things on earth. This basic chart would then turn into the table of elements that we have now.



1700-1800

John Dalton (6 September 1766 – 27 July 1844) Daltons Atomic Theory(1808)
 * Born Eaglesfield, England
 * Discovered what we now call Daltons Law, which is the formula for pressure on gases and liquids.
 * He also produced the first rough copy of what we now call the perodic table of the elements.

Daltons Law(1802)

Antoine Lavoisier (26 August 1743 – 8 May 1794)


 * Born Paris, France
 * Lavoisier is credited as being one of the pioneers of stoichiometry. In his expirements he was able to show that althought a chemical reaction had taken place, No matter was created or distoryed.

Lavoisier means of weighing his reactions (1780)

Charles-Agustin de Coulomb (14 June 1736- 23 August 1806)


 * Born Angouleme, France
 * Coulomb is most noted for his studies on the electro magnetic field. He came up with a formula that lets you dertimine the electric charge and the magnatudes of the charge for any given substance.

basic model of the charges (1780)



1800-1875

Eugen Goldstein(1850 - 1931)

Born Discovered that atoms had possative charges.

Marie Curie (7 November 1867 – 4 July 1934)


 * Born Warsaw, Russia
 * On 12 April 1898 she gave in a paper stating her research on raido active atoms and had helped in the discovery of Uranium.
 * In July 1898 she discovered Polonium.
 * On 26 December 1898 she announces her discovery of radium.

J. J. Thomson (18 December 1856 – 30 August 1940)

Plumb Pudding model (1904) Mass spectrometer (1919) Basic consept of mass spectrometer
 * Born Manchester, England
 * Is credited with the discovery of the mass spectrometer, which is basically determining the composition of a sample based on its mass-to-charge ratio
 * He is also very well known for his Plum Pudding Model. His plum pudding model is the basis of an atom. it says that negatively charged electrons know as the plums, flow around the posatively charged protons know as the pudding. In the model the electrons are in a sence keeping the pudding, or the portons in place keeping the atom at it proper form.

Ernest Rutherford (30 August 1871 – 19 October 1937)
 * Born Brightwater, New Zealand
 * Rutherford is very well known for his Rutherford Model. This model is one somewhat similar to the plum pudding model only he found that it was incorrect. He then took it and changed it to what is now Rutherfords model

Electronicly inhansed version of Rutherford model (1909)

1875-1900 James Chadwick (20 October 1891- 24 July 1974)


 * Born Bollington, England
 * In 1932 he was recorded with the discovery of the neutron inside of the atom which contians no charge
 * He also is credited with finding a way to create atoms heavier then uranium, which would eventually give way to the discovery or neuclear fission.

Neils Bohr (7 October 1885 – 18 November 1962)


 * Born Copenhagen, Denmark
 * He was credited with the establishment of the Rutherford-Bohr Model which states that negatively charged electrons suround posatively charged protons and neutrons which contian no charge at all.

Rutherford-Bohr Model (1913)

Erwin Schrödinger (12 August 1887 – 4 January 1961)
 * Born Vienna, Austria
 * Schrödinger's cat experiment is a thought experiment often described as a paradox, this experiment is something that he is well known for.

Schrödinger's cat experiment (1935)

1900-1915 Werner Heisenberg (5 December 1901-1 February 1976)


 * Born Wurzburg, Germany
 * In 1932 he published papers on his neutron-proton model of the neuclus.
 * He is probably best known for declaration of the uncertainty principle of quantum theory

Henri Becquerel (15 December 1852 – 25 August 1908)
 * Born Paris, france
 * He is best know for the discovery or raidoactivity. Wile studying phosphorescences, and uranium salts he came across there raido activity and evertually led him into nuclear raditation

1915-1950



Robert Millikan (March 22, 1868 – December 19, 1953)


 * Born Morrison, Illinois United States
 * He is very well known for his Oil-drop ecperiment. In the expriement he takes drops of oil and is able to make the move up and down based on the electronic charge that he implants in the plates below.

Oil-drop experiment (1909) Weilhelm Rontgen (27 March 1845 – 10 February 1923)


 * Born Lennep, Purssia
 * Rontgen is most know for his discovery of the x-ray. He came across these rays wile expirementing with cathode rays and fluorescent screen printed paper with barium platinocyanide and a crookes tube which he had wrapped in cardboard to keep the light from showing. He then found that the ray could pass through the cardboard, books, and the papers on his desk. It was then that he used his wifes hand and found that the ray could pass through human flesh but not bone or her metal ring.

X-ray of his wifes hand (1896)

http://library.thinkquest.org/28582/history/plum.htm http://nobelprize.org/ http://www.wikipedia.org/ http://www.britannica.com/EBchecked/topic-art/41549/19493/Millikan-oil-drop-experiment-Between-1909-and-1910-the-American