Lecture #3 - Chemistry 2A-c w2009(Ch2-6 III The Inner...

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Chemistry 2A Chemistry 2A -c w2009 c w2009 (Ch2 (Ch2 -6) 6) Gold foil III. The Inner Structure of Atoms (Rutherford, 1909)
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Chemistry 2A Chemistry 2A -c w2009 c w2009 (Ch2 (Ch2 -7) 7) Rutherford (1919): discovered Proton (p + ), predicted the existence of neutron (n o ) Chadwick (1932): discovered neutron Size of atom 10 -8 cm (Å, Angstrom) (determined by electron cloud) Size of nucleus 10 -13 cm Rutherford atomic model
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Chemistry 2A Chemistry 2A -d w2009 d w2009 (Ch2 (Ch2 -8) 8) e - e - p + p + n o Size of atom 10 -8 cm (Å, Angstrom) (determined by electron cloud) Size of nucleus 10 -13 cm Electron cloud Charge= 2(-) 2(+) Helium atom n o Size of He atom is determined by the electron trajectories
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Chemistry 2A Chemistry 2A -c W2009 c W2009 (Ch2 (Ch2 -9) 9) Mass of neutron Mass of proton 1836 mass of electron Mass of an atom Mass of protons + Mass of neutrons Mass number (A) = # of protons + # of neutrons Atoms are identified by Atomic number (Z) = # of protons of the nucleus
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This note was uploaded on 02/25/2009 for the course CHEM chem 2a taught by Professor Ng during the Winter '09 term at UC Davis.

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Lecture #3 - Chemistry 2A-c w2009(Ch2-6 III The Inner...

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