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Democritus is born
Democritus is widely known for the formantion of the atomic theory. This theory slightly resembles the results from atomic research in the 19th century. -
Antoine Lavoisier is born
Appointed as commisioner of the Royal Gunpowder and Salpeter Administration. Largest contribution was learning that combustion and respiration had to do with a part of the air called oxygen. Lavoisier concluded that water was made of both oxygen and hydrogen atoms. -
John Dalton is born
Dalton studied atoms through the study of meteorology. He published his first book in 1793 called Meteorological Observations -
Michael Faraday is born
Faraday developed the laws of electrolysis, which was the splitting of molecules using electricity.
(http://atomictimeline.net/index.php) -
The Solid Sphere Model
Proposed by John Dalton in 1803. In this model, Dalton included the laws of multiple proportions and definite composition. (http://www.charpan.com/chemistry-the-atomic-models-and-chemistry) -
Henri Becquerel is born
Worked with Pierre and Marie Curie on the discovery of radioactivity. Accidentally contributed through the use of X-rays.
(http://www.nobelprize.org/nobel_prizes/physics/laureates/1903/becquerel-facts.html) -
J.J. Thomson is born
Joseph discovered the electron through a series of experiments. He also suggested a model of the atom where it is a sphere. This is called the Plum Pudding Model. -
Max Planck is born
Planck's quantam theory was used by scientists such as Einstein and Bohr. Bohr used this theory to create an accurate model of the atom. -
Pierre Curie is born
Married to Marie Curie. Discovered, with his wife, the atoms of the elements radium and polonium. (9http://www.nobelprize.org/nobel_prizes/physics/laureates/1903/pierre-curie-facts.html) -
Marie Sklodowska-Curie is born
Married to French Physicist Pierre Curie. Created methods with her husband for the seperation of radium from radioactivity.
(http://www.nobelprize.org/nobel_prizes/physics/laureates/1903/marie-curie-bio.html) -
Robert Millikan is born
Millikan made discoveries in physics, optics, and electricity. Millikan also found the charge of an electron through the "falling-drop" method. -
Ernest Rutherford is born
Rutherford first taught schoolboys before he became a scientist. He eventually recieved a Nobel Piece Prize for his scientific efforts in 1908. -
Lise Steiner is born
Steiner, along with Otto Hahn, discovered the uranium atom can be split. This split can only happen when a multitude of neutrons attack the atom. (http://www.chemheritage.org/discover/online-resources/chemistry-in-history/themes/atomic-and-nuclear-structure/hahn-meitner-strassman.aspx) -
Otto Hahn is born
Hahn was awarded the Nobel Prize for the discovery of the fission of heavy nuclei. Also, he, along with Lise Steiner, discovered a uranium atom can be split. (http://www.chemheritage.org/discover/online-resources/chemistry-in-history/themes/atomic-and-nuclear-structure/hahn-meitner-strassman.aspx) -
Albert Einstein is born
Einstein not only worked in the field of chemistry, but also in physics and medicine. He also worked on an interpretation on the quantam theory.
(http://www.nobelprize.org/nobel_prizes/physics/laureates/1921/einstein-bio.html) -
Niels Bohr is born
Bohr proposed a theory in 1913 of the shape of a hydrogen atom. This theory was based around the quantam theory and states that electrons move around the nucleus in orbits.
(http://www.nobelprize.org/nobel_prizes/physics/laureates/1922/bohr-facts.html) -
Erwin Schrodinger is born
Earned the Nobel Prize for formulating a wave equation for an electron's energy levels.
(http://atomictimeline.net/index.php) -
James Chadwick is born
Chadwick earned a Nobel Prize through his doscovery of the neutron, a neutral particle with the same mass as a proton.
(http://www.nobelprize.org/nobel_prizes/physics/laureates/1935/chadwick-facts.html) -
Louis de Broglie is born
Broglie's theory gave an explanation to the movement of electrons. This theory eventually gained him a Nobel Piece Prize in 1929. -
Plum Pudding Model
Proposed by J.J. Thomson in 1897. This model proposed that the atom was a mass of positive charges with negative charges inside of it. The name was given since the negative charges seemed like raisins in pudding. (http://www.charpan.com/chemistry-the-atomic-models-and-chemistry) -
Planetery Model
This model was developed by both Ernest Rutherford and Niels Bohr. This model proved Thomson's theory wrong through Rutherford's Gold Foil Experiment. This model is the more frequently used model of the atom. (http://www.iun.edu/~cpanhd/C101webnotes/modern-atomic-theory/rutherford-model.html) -
Glenn T. Seaborg is born
Seaborg served as chairman of the Atomic Energy Comission from 1961 to 1971. Seaborg also combined six transuraniam elements and suggested a change in the format of the periodic table. (http://atomictimeline.net/index.php) -
Electron Cloud Model
This model depicts the electrons not moving in a fixed orbit, but rather within certain boundaries. These boundaries create clouds that the electrons move around in. -
Quantam Mechanical Model
This model was developed by Erwin Schrodinger. In order to find an electron in a certain position, Schrodinger would use mathematical equations. Contrary to the Bohr Model, this model does not exactly describe the path of an electron.
(http://www.abcte.org/files/previews/chemistry/s1_p6.html) -
Aristotle is born
One of the most important of the Greek philosophers. Most of his writings included topics such as writing, theater, logic, poetry, and science.
