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Timeline of the Atomic Structure

A detailed history of the atom.

Devon Urness

on 17 October 2012

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Transcript of Timeline of the Atomic Structure

By: Devon Urness The Atomic Structure Democritus
(460-370 B.C.) Leucippe Aristotle
(384-322 B.C.) John Dalton
(1766-1844 A.D.) Alchemists
(Middle Ages) Sir William Crookes
(1832-1919 A.D.) 442 B.C.
He was the first to say that matter is composed of empty space where atoms move. He described atoms as solid, homogeneous, indestructivle, and indevisible. Atoms have different sizes and shapes he believed which determine the propperties of the matter which they compose. 420 B.C.
He named the substance that makes up all matter and elements the "atom". He denied the existence of atoms!! Middle Ages
They studied matter and the four elements. They developed the original observation, experimentation, measurements, and classification of elements. 1803 A. D.
He proposed that all matter was made up of atoms, all atoms of a specific element are identical, and atoms cannot be created, divided, or destroyed. 1862 A.D.
He discovered Thallium which he noted had the property to repel radiation. Also, he discovered the cathode ray in a dark lab. 1897 A.D.
He discovered the electron.
1904 A.D.
He proposed the electron cloud model. He got his inspiration from plum pudding. J.J. Thomson
(1856-1940 A.D.) 1898 A.D.
They discovered polium and radium in pitchblend. They also worked extensively with radioactive elements which eventually lead to their deaths. Pierre Curie (1859-1906 A.D.)
Marie Curie (1867-1934 A.D.) 1931 A.D.
He created a new model of the atom so that the electrons are rotating in a 'quantified orbit'. Niels Bohr
(1885-1962 A.D.) 1913 A.D.
He was the first scientist
to discover the neutron although they had been thought to exist. James Chadwick
(1891-1974 A.D.) Dmitri Mendeleiev
(1834-1907 A.D.) 1869 A.D.
He created a table to classify elements based on their atomic number. It is still used today. 1984 A.D.
He discovered quarks, which is a type of charged particle. Murray Gell-Mann
(1929-Present) Dingrando, Laurel, Kathleen Gregg, Nicholas Hainen, and Cheryl Wistrom.
Chemistry: Matter and Change. Student Edition. Columbus:
McGraw-Hill Companies, Inc., 2002. 87-97. Print.

none, . "Chemistry in History." Chemistry in History. 1.1 (2010): 1. Print.

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none, . "Sir William Crookes." NNDB. Soylent Communications, n.d. Web.
16 Oct 2012. <http://www.nndb.com/people/965/000100665/>.

none, . "Murray Gell-Mann." Nobelprize.org. The Nobel Foundation, 17
2007. Web. 16 Oct 2012. <http://www.nobelprize.org/nobel_prizes/physics/laureates/1969/gell-mann-bio.html>. Bibliography
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