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MAIN IDEAS 1.Electrons 2.Cathode Ray 3.Protons 4.Neutrons 5.Nucleus KEY CONCEPTS 1.What are the kinds of subatomic particles? 2.How can you describe the structure of the nuclear atom? IaN pg. 5
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2 Electr on Cloud REGIO NS PARTIC LES Neutr on Nucle us Proto n Electr on I. Subatomic Particles A. Protons (+), Electrons (-), Neutrons (0) B. Change to Dalton’s Theory = atoms are divisible!
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1. In 1897 JJ Thomson (1856 – 1940) discovered that atoms contain tiny, negatively charged particles called electrons using the Cathode Ray Experiments.
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Negative ly Charged Beam Positively charge plates
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Watch what happens when the magnet is placed above and below the electron beam.
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D.Robert Milikan (1868-1953) 1. U.S. Physicist 2. Experiments quantity of charge a. Thomson’s ratios calculates mass of electron (1916) 3. One unit of negative charge & 1/1840 the mass of a Hydrogen atom Why a Hydrogen atom?
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1. 1932 – Eugene Goldstein (1850 – 1930) a. Evidence of positively charged particles using Cathode Ray = Protons b. Mass 1840 X an electron
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2. 1932 James Chadwick, English Physicist (1891 -1974) discovers the neutron. a. No Charge b. Mass nearly = to proton How are the subatomic particles arranged?
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1. 1911, Ernest Rutherford (1871 -1937) provided evidence that the atom is mostly empty space. He named, nucleus = small dense (+) charged center. a. Gold Foil Experiment – Alpha particles passing through & deflected by gold foil
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Dalton’s Model “Solid Sphere” Thomson’s Model “Plum Pudding” “Solar System” Rutherford’ s Model NUCLEAR ATOM – Protons & Nuetrons in the nucleus. Electrons take up most of the volume
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ORAN GE CARD GREEN CARD # NOTES = N TEXTBOOK = T w/ PAGE # MISSED GREEN CARD #’s % CORREC T 15 = N3 Card Sort Activity Top ½ IaN pg. 4 INFERENCEREFERENCE
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