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in 1808, English chemist John Dalton (1766–1844) rephrased the theory in modern terms. Dalton thought of atoms as tiny, indivisible particles, similar to ball bearings or marbles. Dalton's theory of atoms satisfactorily explained what was then known about matter; it was quickly accepted by many other (although not all) chemists.
 * **460-370 B.C.** || **[|Democritus] of - Greek philosopher; pupil of Leucippus; developed atomic theory; elaborated idea that matter consisted of atoms having physical size and shape which constantly moved in a void and interacted in different ways; Greek word atoma means indivisible. http//www.wikipedia.com** ||

Read more: [|Atom - body, used, chemical, energy, oxygen, parts, History, Modern models of the atom, Physical dimensions] []
 * [|J.J. Thomson] was venturing into the interior of the atom. At the Cavendish Laboratory at Cambridge University, Thomson was experimenting with currents of electricity inside empty glass tubes. He was investigating a long-standing puzzle known as [|"cathode rays."] http://www.aip.org/history/electron/jjthomson.htm [[image:http://www.aip.org/history/electron/images/cathtub1.jpg width="179" height="117" link="http://www.aip.org/history/electron/jjcathtu.htm"]] I

In 1932,John Chadwick discovered the elusive final basic particle of the atom, the neutron. []

The different particles that make up the atom are theproton, neutron, and electron, and they are located in the nucleus. Atoms of different elements are different because they are all made of different amounts of protons, electrons, and neutrons.

//**MAKE SURE YOU ADD A LINK TO THE PAGE WHERE YOU FOUND YOUR INFORMATION OR YOU WON'T GET THE POINTS!!!**//

History of the Atom (5pts) Atomic Structure (5pts) For a bonus point:
 * Find out the important scientists who contributed to our current knowledge of the atom. Include:
 * A picture.
 * When they lived.
 * What they did.
 * Find out the important experiments that were used to make breakthrough discoveries.
 * Who perfomed these experiments?
 * Include years of each discovery/experiment so we can get an idea of how long this process has taken.
 * What are the different parts of the atom?
 * What are the different particles that make up the atom?
 * Where are they located?
 * What makes atoms of different elements different?
 * 1) Add an APPROPRIATE comment to someone's page through the discussion tab.

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