Fall.2008MMA.Lee.Timeline

 **__Atomic Theory Time line__** **500 B.C -350 B.C** There were not really major philosophers or anybody going by the title of "chemist" but there was chemisty going on. Alchemists were the acheint version of todays chemist. **Democritus**(460 B.C-370 B.C), a Greek philosopher- made a similar statement to Jhon Dalotn's his statement is that all matter is made up of atoms. He also stated that atoms are eternal and invisible and so small that they can’t be divided, and they entirely fill up the space they’re in.
 * Alchemists** - Alchemists main goal was to obtain the Philosopher's Stone, which had materials like copper or lead, into valuable substances, like gold. They also sucked my dick for the Elixir of Life, which when drunk by a particular person, would grant him sexual pleasure Alchemy was extremely popular with the Chinese, many of whom spent decades searching for the Elixir of Life and many lost their life testing their creations.


 * Aristotle** ( 384 B.C-322 B.C), another Greek philosopher - provided the method of gathering scientific facts, which proved as the basis for all scientific work . This was later refined and called The Scientific Method.

**  **Antoine Lavoisier** (1743 A.D-1794 A.D), a French chemist - he provided the formula for the conservation of matter in chemical reactions, and also was the first one to distinguish between an element and a compound **John Dalton** (1766-1844), discovered what came to be his atomic theory in the early 1800s. The five main points to Daltons atomic theory with atoms of other elements to form chemical compounds; a given compound always has the same relative numbers of types of atoms. Atoms cannot be created, divided into smaller particles, nor destroyed in the chemical process; a chemical reaction simply changes the way atoms are grouped together.
 * __1700-1800 A.D__.


 * 1800-1875**

JJ Thompson **(1856-1940) an English chemist- He came up with the “plum pudding” model for atomic structure. Were the electrons are inside the positve "pudding". ** The Curies ** (Marie 1867-1934, Pierre 1859-1906), French physicists- discovered radium and polonium when they started to investigate radioactive substances.
 * Sir William Crookes ** ( 1832-1919), an English “man of science” – he created the Crookes’ tube and demonstrated that cathode rays travel in straight lines and produce phosphorescence and heat when they strike certain materials. J.J Thompson furthered his research with his discovery of the subatomic nature of the Cathode rays and prove that the rays consist of negative electrons.
 * Henri Becquerel **(1852-1908), a French physicist - he discovered radioactivity when he investigated uranium and other radioactive substances**.** He was awarded half of the Nobel Prize in Physics for his discovery. The other half was awarded to the Curie's for their research in Becquerel radiation.
 * [[image:http://www.studentsoftheworld.info/sites/science/img/16502_250px-Jj-thomson2.jpg width="201" height="234"]]


 * Robert A. Millikan** (1868-1953), . He detrmined the atomic structure of electricity and established the charge of an electron. He determined these things due to his oil drop experament.


 * W.K. Roentgen ** (1895- 1923 ), a German chemist – Roentgen discovered x-rays while experimenting with cathode-ray tubes, he found them by accident and tested them on a variety of thing including his wife’s hand. He was also rewarded the Nobel Prize in Physics for this discovery.
 * Niels Henrik David Bohr** (1855-1962) a English physicist, Niels Bohr discovered a new model for the structure of the atom. The Bohr model is simialr to the plantetary model in that the electrons orbit the nuecelus of the atom were the electrons are held in orbit by the magnetic atrraction between the electrons and the protons rather than gravity.
 * The Bohr Model**

Ernest Rutherford** (1872-1937), a New Zealand chemist. Rutherford invented a electromagnetic detector. He also helped with the making of the Planitary atomic model.
 * [[image:http://images.google.com/url?q=http://www.mlahanas.de/Physics/Bios/images/ErnestRutherford2.jpg&usg=AFQjCNGrlxVlooq23k5S1Wv_j0hadepVpg width="248" height="325"]]


 * 1875-1900**

** Max Planck (1900), **A German chemist ** - ** originated the quantum theory
 * Otto Han** (1879-1968), a german chemist. He awarded the Nobel Prize in Chemistry for his discovery of the fission of heavy nuclei.
 * James Chadwick** (1891-1974), an English physicist: he worked under Rutherford after World War 1, after which he made his discovery of neutrons; he was awarded the Hughes Medal of the Royal Society in 1932, and subsequently the Nobel Prize for Physics in 1935.
 * George de Hevesy** (1885-1996) he was awarded the Nobel Prize in Chemistry for his work on the use of isotopes as tracers in the study of chemical processes.


 * 1900-1915**
 * Albert Einstein** published is theory of realativity in 1905.
 * Werner Heisenberg** (1901-1976) a German physicist, He created quantum mechanics,  Heisenberg suggested that any theory of the atom must be based on observable phenomenon, such as the spectral lines emitted by atoms, and not pictorial constructs such as  Bohr's nuclear model of the atom

Geiger** (1925), a german chemist**-** introduced the first detector of alpha particles and other radiations. Erwin Shroedinger (1926),** an Austrain chemist **-** introduced the Shroedinger Equation, a wave equation that describes the form of the probability waves that govern the motion of small particles and how these waves are altered by external influences. ** Lise Meitner (1938), ** a Viennen chemist ** - ** worked with Otto Hahn to discover uranium fission. _
 * 1915-1950**
 * [[image:http://www.chemcool.com/biography/geiger.jpg width="165" height="194"]]
 * [[image:http://www.hmi.de/bereiche/SF/SF7/PANS/english/nobel/Schroedinger/Schroedinger_01.jpg width="158" height="234"]]


 * Small, Sphereical, Solid, indivisible model

Electron Cloud Model**


 * Plum Pudding Model**


 * Planetary Model**
 * Rutherford Gold Foil Experiment**

[|http://nobelprize.org] http://www.iun.edu/~cpanhd/C101webnotes/composition/dalton.html [|http://dl.clackamas.edu/ch104-04/dalton's.htm] l D. Reich's Chemistry Slides Week 4 Lesson 1 http://images.google.com/