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The History of Discovery of the Atoms

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Shubhana Shiwakoti

on 2 December 2010

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Transcript of The History of Discovery of the Atoms

History of the Discovery of Atoms Democritus (460-370 B.C.):
He was born in the city of Abdea in Thrace on Ionian colony of Greece. He gave the atomic theory for the cosmos. He gave this theory with reference to his thoughts and ideas. John Dalton:
He was born in Eaglesfield, Cumberland, England. He performed an experiment which led him to propose Law of Simple Multiple Proportions in 1803. This helped him explain how and why elements would combine with one another in fixed ratios and sometimes also in multiple of those. He was also given the title of the "Father of Modern Atomic Theory." Project by : Stephanie Martinez Jessica Jalal ShubhanaShiwakoti William Crookes:
He was born in London. He discoveredCathode Ray Tube in 1879. He noticed a flash of light eithin one of the tubes in the dark lab which was originated from cathode. He investigated tha properties of Cathode Ray Tube which is used in modern televisions. J.J. Thomson:
He was born in Manchester, England.
He identified electron in 1897 by a
series of cathode ray tube experiments.
He concluded that there were smaller
particles than atom and proved Dalton
wrong. Also , he had identified the plum pudding model. Robert Milikan:
He was born in Morrison, USA. He determined the charge of an electron through oil drop experiment in 1909. He concluded that an electron is negatively charged. Ernest Rutherford:
He was born in Brightwater, New Zealand. He discovered nucleus of an atom. He shot alpha particles at goldfoil, finding the atomic theory. The alpha particles were allowed to pass though in a small diaphragm and were directed toward their own target. James Chadwick:
He was born in Manchester, England. He proved the existence of neutron in 1932. He received scholarship and focused on radioactivity. He knew that there were other particles of atoms to discover which made him do a lot of research.
Neils Bohr:
He was born in Copenhagen. Bohr acknowledged that electrons existed at set levels of energy, that is, at fixed distances from the nucleus. Bohr discovered that Ernest Rutherford's idea of the structure of an atom had a few problems. He also discovered nucleus.
http://www.google.com/imgres?imgurl=http://upload.wikimedia.org/wikipedia/commons/e/e9/John_Dalton.jpg&imgrefurl=http://commons.wikimedia.org/wiki/File:John_Dalton.jpg&usg=__4HW3crXC9Atm4wW1fJmVG2_icgg=&h=937&w=672&sz=282&hl=en&start=0&zoom=1&tbnid=HDjLTs-PxU7ctM:&tbnh=160&tbnw=123&prev=/images%3Fq%3Djohn%2Bdalton%26um%3D1%26hl%3Den%26biw%3D1229%26bih%3D489%26tbs%3Disch:1&um=1&itbs=1&iact=hc&vpx=463&vpy=97&dur=24&hovh=265&hovw=190&tx=82&ty=137&ei=mQb3TPKAHYP6lwfZ3pjHBQ&oei=mQb3TPKAHYP6lwfZ3pjHBQ&esq=1&page=1&ndsp=14&ved=1t:429,r:2,s:0 Bibliography : http://atomictimeline.net/index.php http://www.google.com/images?hl=en&q=niels+bohr&um=1&ie=UTF-8&source=og&sa=N&tab=vi&biw=1229&bih=489
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