lecture3 (10-4-2006) Ch 2

lecture3 (10-4-2006) Ch 2 - Chemistry 2A-c F2006 (Ch2-6)...

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Chemistry 2A Chemistry 2A -c F2006 c F2006 (Ch2 (Ch2 -6) 6) Gold foil III. The Inner Structure of Atoms (Rutherford, 1909)
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Chemistry 2A Chemistry 2A -c F2006 c F2006 (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 F2006 d F2006 (Ch2 (Ch2 -8) 8) e - e - p + p + n o Electron cloud Charge= 2(-) 2(+) Helium atom n o Size of atom 10 -8 cm (Å, Angstrom) (determined by electron cloud) Size of nucleus 10 -13 cm Size of He atom is determined by the electron trajectories
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Chemistry 2A Chemistry 2A -c W2006 c W2006 (Ch2 (Ch2 -9) 9) IV. Chemical Elements 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 04/23/2008 for the course CHEM 2A taught by Professor Guo during the Fall '08 term at UC Davis.

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lecture3 (10-4-2006) Ch 2 - Chemistry 2A-c F2006 (Ch2-6)...

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