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History of the Atom

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Information about History of the Atom
Education

Published on August 17, 2009

Author: bsndev

Source: authorstream.com

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Atomic Theory : 1 Atomic Theory History of the Atom History of the Atom : 2 History of the Atom Democritus- lived around 300b.c. Said that the smallest part of matter is an atom Slide 3: 3 History of the Atom : 4 History of the Atom Aristotle- lived around 300b.c. Said that matter was composed of 4 elements: Earth Wind Fire Water Slide 5: 5 History of the Atom : 6 History of the Atom John Dalton- 1808 Said that: Each element is made of atoms that are all alike Different elements have atoms of different mass Imagined atoms as tiny, solid spheres Dalton’s Model : Dalton’s Model Tiny, solid spheres 7 Slide 8: 8 History of the Atom : 9 History of the Atom J. J. Thomson- 1897 Said that: Atoms are positively charged spheres with electrons embedded in them Thomson’s Model : Thomson’s Model Chocolate chip cookie model 10 Slide 11: 11 History of the Atom : 12 History of the Atom E. Rutherford – 1911 Said that : Electrons orbit around a small, positively charged nucleus Rutherford’s Model : Rutherford’s Model Positive nucleus surrounded by negative electrons 13 Slide 14: 14 History of the Atom : 15 History of the Atom Niels Bohr 1913 Said that: Electrons move in specific energy levels around the positive nucleus Bohr Model of the Atom : Bohr Model of the Atom Electrons in Energy Levels 16 Slide 17: 17 The Present Model of the Atom : 18 The Present Model of the Atom Electron cloud model The position of an electron is impossible to predict, instead it forms a cloud of negative charge Slide 19: 19

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