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imental investigations on the conduction of electricity by gases Alpha Scattering Rutherford’s Discovery of the Atomic Nucleus (1911) He found that, once in a while, the aparticles were scattered backwards by the target Solar System Model of the Atom The atom consists of electrons orbiting around small but dense central nucleus Lord Ernest Rutherford 1908諾貝爾化學獎 Bohr’s Model of the Hydrogen Atom (1913) He proposed that only certain orbits for the electron are allowed Bohr’s Empirical Explanation ?Electrons can only take discrete energies (energy is related to radius of the orbit) ?Electrons can jump between different orbits due to the absorption or emission of photons ?Dark lines in the absorption spectra are due to photons being absorbed ?Bright lines in the emission spectra aredue to photons being emitted The Nobel Prize in Physics 1922 Copenhagen University Copenhagen, Denmark Niels Henrik David Bohr for his services in the investigation of the structure of atoms and of the radiation emanating from them The Nobel Prize in Physics 1935 for the discovery of the neutron James Chadwick United Kingdom Liverpool University Liverpool, United Kingdom The Nobel Prize in Physics 1990 for their pioneering investigations concerning deep inelastic scattering of electrons on protons and bound neutrons, which have been of essential importance for the development of the quark model in particle physics Jerome I. Friedman Henry W. Kendall Richard E. Taylor 物質(zhì)是無限可分的嗎 “毛子 ” 我們?yōu)槭裁匆芯炕玖W?? 介