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Atomic Timeline

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sierra wilkinson

on 8 October 2012

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Transcript of Atomic Timeline

Sierra Wilkinson Atomic Timeline ATOMIC TIMELINE! Rather than electrons being disturbed by another electron configuration of energy levels. They were arranged in orbitals which were distributed within electron clouds. Edwin Schrodinger 1930 He assumed that electrons travel in stationary orbits defined by their angular momentum. This led to the calculation of energy levels for these orbit. Niels Bohr 1922 He believed that all things were made up of atoms. Atoms can't be created nor destroyed. He made that Billiard Ball model. John Dalton 1803 Faraday discovered how to split molecules with electricity. He called this the 'law of electrolysis'. In 1864 he published the periodicity of chemical elements. He had them arranged in order of atomic mass. He discovered that every eighth element shared a resemblance. Dmitri Mendeleev 1864 Aristotle had to keep all theories updated and he has to form the knowledge into one idea. He believed that Democritus atoms didn't account for the great variance f matter. Aristotle 384-322 B.C. Democritus discovered that every Structure is made up of atoms. Atoms are invisible and can never be destroyed. Democritus 460 B.C. He was the first to discover that there was electron rays in a vacuum. Later, he discovered that cathode rays were deflected by magnets. Julius Plucker 1859 He was the first scientist to classify elements into groups. He grouped elements with similar chemical properties into clusters of three and called them 'triads'. Johann Dobereiner 1829 William Crookes discovered that matter is composed of tiny particles and that magnets have a negative. He called this the cathode rays. William Crookes 1861 He discovered that Isotope 135 of the uranium atom was the cause for the experiment producing radio activity because of the isotope's unstable structure. Lise Meitner 1939 Michael Faraday 1832 Henri Becquerel 1896 He mixed potassium and uranium that he put it out in the sun for a period or time . He then put it on a photographic plate wrapped in black paper. He found out that uranium had absorbed the sun's energy and then turned the energy into x-rays. Marie Curie 1898 She discovered that radioactivity showed that atoms are divisible. J.j. Thomson 1899 He Discovered the charge of a mass ratio of an electron. He also found that that "Canal ray" are associated with protons. MY
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