Transcript AP Physics Chp 30

AP Physics Chp 30
• Rutherford Gold Foil Exp
• Nucleus
• Emission Spectra for atoms
 1
1 
 R 2  2 
 nf


n
i


1
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R = 1.097x107 1/m Ryberg const.
Lyman series drops to the n=1
Balmeer series drops to the n=2
Paschen series drops to the n=3
• Bohr Atom
• hf = Ei – Ef
released
Energy needed to excite it =
En  (2.18 x10
Z is the number of protons
18
2
Z
J) 2
n
• Quantum Mechanical Model
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n= 1,2,3….
l= 0,1,2……n-1
ml= -l to +l for every l value
ms= ½ or - ½
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n is the principal q. number
l is the shape
ml is the orientation
Ms is the spin
• n2 is the maximum number of orbitals
• 2n2 is the maximum number of electrons
• Why don’t we use these for our electron
configurations
• i.e. 2,1,0,1/2
• Pauli exclusion principle
• No two can have the same 4 q. numbers
• Hund’s Rule – Half fill first
• Aubau Principle – lowest energy first
• H: 1s1
• N: 1s22s22px12py12pz1 vs 1s22s22p3
• Mn: ?