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Copy of Atomic Structure Timeline

A timeline depicting the development of the scientific model of the atom.
by

Jessica Berger

on 8 January 2013

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Transcript of Copy of Atomic Structure Timeline

Atomic Structure Timeline 400 B.C. (5th century B.C.) 1897 Democritus of Adbera Ernest Rutherford ~his atomic theory posited that all matter is made up small indestructible units he called atoms. Democritus was the first person to propose the existence of an ultimate particle. He described this particle using the word "atomos". He made this proposition in 420 B.C. mid 300’s BC Aristotle Aristotle believed in the four elements of earth, wind, water, and fire. He also believed that a portion of matter could be cut in half infinitely many times. 1803, 1805, 1808 John Dalton Dalton proposed the Law of Multiple Proportions. This law led to the development of the atomic theory. He pictured the atom as a small indestrucible particle with no internal structure. Joseph John Thomson 1897 Thomson identified the negatively charged electron. He concluded that the electron was a component of all matter. He also proposed the "plum pudding" model of the atom. 1900 1911, 1915, 1918 1912 1924 1926 1927 1932 Ernest Rutherford published an atomic theory in which the atom has a central positive nucleus surrounded by negative orbiting electrons. Max Planck
Max Planck developed the concept of quantum mechanics. His This concept served as the foundation for all modern physics and most atomic models. Robert Millikan Millikan determined the unit charge of the electron. His discovery allowed for the calculation of the electron and all positively charged atoms. Niels Bohr Bohr proposed an atomic structure theory that stated the outer orbit of an atom could hold more electrons than the inner orbit. Louis deBroglie deBroglie proposed that electrons could behave as waves under certain conditions. He stated that electrons have a wave/particle duality. Erwin Schrödinger Erwin Shrodinger developed the Shrodinger equation. This equation can be used to predict the properties reactivities of all atoms and molecules. His work led to the atomic cloud model. Werner Heisenberg Werner Heisneberg discovered the Heisenberg Uncertainty Principle which states that the momentum and position of a particle cannot be simultaneously measured with high precision. James Chadwick James Chadwick confirmed the existence of the neutron. Sources cited Greek thinker Leucippus and Democritus came up with the idea of an indivisible(uncuttable), solid sphere model Plum-pudding Model positive sphere (pudding) with negative electrons (plums) dispersed throughout Nuclear Model
dense, positive nucleus surrounded by negative electrons Planetary Model
electrons move in circular orbits within specific energy levels http://fireisthebest.wikispaces.com/The+Solid+Sphere+Model http://www.barcodesinc.com/articles/timeline-on-atomic-structure.htm http://www.sparknotes.com/testprep/books/sat2/chemistry/chapter4section4.rhtml wikipedia dates http://www.flashcardmachine.com/atomic-structure-people.html http://atomictimeline.net/index.php http://www.timetoast.com/timelines/25291 http://library.thinkquest.org/19662/low/eng/ancient.html
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