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Atomic Theory Timeline Project

Jenny Lee & James Parsons 3rd Hour Chemistry
by

Jennyfer Lee

on 23 October 2012

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Transcript of Atomic Theory Timeline Project

Atomic Theory Time Line. Jenny Lee
&
James Parsons Democritus Democritus 460 B.C. - 270 B.C. B.C./A.D. Changeover Antoine Lavoisier August 26, 1743-November 1873 John Dalton September 6, 1766 - July 26, 1844 Dimitri Mendeleev February 8, 1834 - February 2, 1907 J.J. Thomson December 18, 1856 - August 30, 1940 1800 A.D. 1834 A.D. 1856 A.D. 1803 A.D. 1782 A.D. 1600 A.D. 1500 A.D. 1400 A.D. 1300 A.D. 1100 A.D. 1200 A.D. 1000 A.D. 900 A.D. 800 A.D. 700 A.D. 600 A.D. 500 A.D. 400 A.D. 300 A.D. 200 A.D. 100 A.D. 100 B.C. 200 B.C. 300 B.C. 400 B.C. 500 B.C. Beginning of Time 1900 A.D. 2000 A.D. 1916 A.D. Robert A. Millikan March 22, 1968 - December 19, 1953 1911 A.D. Niels Bohr October 7, 1885 - November 18, 1962 Ernest Rutherford August 30, 1871 - October 19, 1953 1913 A.D. Henry Mosely November 23, 1887 - August 10, 1915 Democritus Erwin Schrödinger August 12, 1887 - January 4, 1961 1887 A.D. 1887 A.D. 1891 A.D. Sir James Chadwick October 20, 1891 - July 24 1974 2012 A.D. October 23, 2012 This Project was turned in on Proposed that the world is made of empty space and tiny particles called atoms.Thought that atoms are the smallest particles of matter.Created the Atomic Theory. Studdied Lavoisier and Proust, and later created his theory that explained the Law of Definite Proportions.
Realized that if matter were composed of indivisible atoms, then a chemical reaction would only rearrange those atoms, and no atoms would be created or destroyed.
If each element consisted of atoms of a specific type and Discovered matter is neither created or destroyed merely transformed.mass, then a compound would always consist of a combination of the very same atoms of the first elements. Measured chemical reactions in sealed containers.
Discovered matter is neither created or destroyed merely transformed.
Law of Conservation of Mass All matter is made of atoms
Atoms are indestructible and cannot be divided into smaller particles
All atoms of one element are exactly alike, but they are different from atoms of other elements. Dalton's Atomic Theory Discovered a repeating pattern in physical and chemical properties when the elements are organized by increase in atomic mass.
Developed the Periodic Table of Elements and published it in 1869. In 1987 J.J. Thomson discovered that the solid ball model of an atom was incorrect because there were negatively charged particles within the atom as well as positive durring the Cathode Ray Tube Experiment. He gave the atom model it's electrons, calling it the Plum Pudding Atomic Model. The atom was similar to a chocolate chip cookie, consider the chocolate chips electrons and the rest of the cookie is positively charged. Rutherford conducted the Gold Foil experiment, which was a series of tests in which alpha particles (positive charge) were fired to a sheet of gold foil. Either it would go through the foil or it would bounce off in a different direction. This proved the existence of a nucleus to the scientific community, creating the Rutherford Model in 1911. In 1913, Niels Bohr created the Bohr Planetary Model, which suggested that the electrons in an atom act as planets revolving around a sun-like nucleus. He based this idea on the fact that gravity pulls things together and if there is a nucleus and space as wel as electrons, the electrons must remain in constant motion to keep from being drawn into the nucleus. Schrödinger suggested that the atom had an electron wave like orbit. The model is a visual estimation of the most probable spots for an electron of an atom to be placed. It is now called the Electron Cloud Model. In 1916 he provided an experimental proof of the law formulated by Albert Einstein, describing the photoelectric phenomenon. He investigated cosmic rays and atomic structure until the age of 77. Sir James Chadwick discovered the Neutrons in the nucleus of an atom that have a neutral charge, rather than just containing protons to counteract the electrons. Developed the X-ray spectra to study atomic structure. Developed a more acurate positioning system for the periodic table of elements by finding more precise atomic numbers. Quantum Mechanical Model- The most recent model of the atom structure. It is based on quantum mechanics and says there are 7 possible energy levels and 4 types of sub levels. This is the atomic model we hold as standard today. Quantum mechanical Model 1926 A.D.
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