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An element is a substance made from only one type of atom. An element cannot be broken down into any simpler substances. ... Elements contain only one type of atom. ... Other experiments showed that it would take about 2000 electrons to weigh the same as the lightest atom, hydrogen. He called the tiny,
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www.broadeducation.com/htmlDemos/AbsorbChem/HistoryAtom...
www.broadeducation.com/htmlDemos/AbsorbChem/HistoryAtom/page.htm
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A BRIEF HISTORY OF ATOMIC THEORY DEVELOPMENT ... Thomson had identified that the atom was composed of positive and negative charges and had proposed that the atom was a solid mass of these particles. If this model were true, any particles shot at the atom should be deflected by it.
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www.neoam.cc.ok.us/~rjones/Pages/online1014/chemistry/c...
www.neoam.cc.ok.us/~rjones/Pages/online1014/chemistry/chapter_8/pages/history_of_atom.html
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Ernest Rutherford (1909), England - used the results of his gold-foil experiment to state that all the mass of an atom were in a small positively-charged ball at the center of the atom.
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hi.fi.tripod.com/timeline/
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The Models of the Atom ... This took us thousands of years to realize, and the present chapter is a journey through that history, one that eventually gave us enough understanding and power to mimic, harm and repair nature in ways never before possible.
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www.emsb.qc.ca/laurenhill/science/models.html
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Description of discoveries and attainments in world's microstructure physic accomplished throughout two thousand-year-old history of this science development also takes place here. ... Logo-Atom...
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library.thinkquest.org/19662/high/eng/index.html
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Learn what happened on This Day in History at History.com. ... History Made Every Day™ ... On this day in 1945, at 5:29:45 a.m., the Manhattan Project comes to an explosive end as the first atom bomb is successfully tested in Alamogordo, New Mexico.
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www.history.com/this-day-in-history.do?action=VideoArti...
www.history.com/this-day-in-history.do?action=VideoArticle&id=6521
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This "mushroom cloud" appeared above Japan after the explosion of the atom bomb in early August, 1945. In the two atomic bomb attacks of that fateful August, more than 120,000 people died. If instead of the bomb a military invasion of Japan had been elected, ... Send this image to a friend as a Picture History e-card.
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www.picturehistory.com/find/p/3643/mcms.html
www.picturehistory.com/find/p/3643/mcms.html
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ne hundred years ago, amidst glowing glass tubes and the hum of electricity, the British physicist 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.
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www.aip.org/history/electron/jjhome.htm
www.aip.org/history/electron/jjhome.htm
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Bohr Hydrogen Atom ... Hydrogen atom emits photon ... Bohr set about explaining the visible spectrum of the hydrogen atom, i.e., the Balmer series of lines familiar to just about everyone who has ever taken an astronomy lab. Bohr was able to show that this set of violet, blue and red lines originated from an electron...
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www.cerritos.edu/ladkins/a106/a%20brief%20history%20of%...
www.cerritos.edu/ladkins/a106/a%20brief%20history%20of%20the%20atom.htm
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