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Essay heading: Historical development of the atom
 
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Issue: Science
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Date added: October 26, 2007
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No of pages / words: 2 / 457
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They theory that prevailed was Cannizzaro theory. John Thomson was born in 1856, and is recognised as the British scientist who discovered and identified the electron. In 1897 Thomson demonstrated that cathode rays - high-speed electrons emitted by a negative electrode of a vacuum tube when an electric current passes through it - were actually units of electrical current that were made up of negatively charged particles that were smaller than an atom...
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In early 1915 he announced his version of an atom structure: a very small, very tightly packed, charged nucleus which had electrons orbiting it. Bohr was a Danish physicist who was born in 1885. He thought that electrons move in definite orbits around the nucleus, like planets moving around the nucleus...
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