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Created with Fabric.js 1.4.5 1875 1785 1803 1896 1930 1909 1913 1905 1927 1909 1932 1913 Atomic History Lexey Shick Atomic History Lexey Shick 3315 3/3/15 John Dalton Atomic model Antoine Lavoisier He came up with the Law of Conversation of Mass that states that matter cannotbe made or destroyed. 1799 Joseph Proust He came up with the Law of Constant Composition that states that the ratio of elements in a compundare always the same. William Crookes Designed the Crookes Tube, in which the cathode rays and streams of electrons were discovered. This experiment is an electrical discharge tube, with partial vacuum The Crookes Tube. Henri Becquerel He was the discovery of Radioactivity. Proposed an "atomic theory" with spherical solid atoms based upon measurable properties of mass. Albert Einstein He discovered the famousequation of E=mc2. Robert Milikan He discovered the oil drop experiment to determinecharge and mass of an electron. Ernest Rutherford He discovered the Gold Foil Experiment, whichdescribed the nuclearstructure of an atom. J.J. Thomson He discovered isotopesand ions. Niels Bohr He discovered the Bright LineSpectrum that separates bright lines, each with its own definite wave length representing an atom. Described atoms by means of formula connected to the frequencies of spectral lines. Werner Heisenberg Erwin Schrodinger He discovered the Quantum Mechanics, which it is the branch of mechanics that deals with the mathematical description of the motion and interaction of subatomic particles. James Chadwick Using alpha particles discovered a neutral atomic particle with a mass close to a proton. Thus was discovered the neutron. Becquerel doing anexperiment with radioactvity. When he channeled a stream of ionized neon through a magnetic and an electric field and used deflection techniques to measure the charge to mass ratio.
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