PROBLEM SET 3

# PROBLEM SET 3 - n=1 l=0 m=0 n=2 l=0 m=0 l=0 m=0 l=1...

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MSE 110 - UA n=1 n=2 n=3 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 5g 6s 6p 6d 6f 6g 6h 7s 7p 7d 7f 7g 7h 7i l=0 m=0 l=0 m=0 l=1 m=-1,0,1 l=0 m=0 l=1 m=-1,0,1 l=2 m=-2,-1,0,1,2 Sub-orbitals in each level (not arranged by energy)

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MSE 110 - UA • Aufbau principle for atoms with many electrons ATOMIC STRUCTURE Rules for filling orbitals: For n>3 the n shell overlaps and lower state from the n shell can have lower energy than the higher state from the n-1 shell. Example 4s<3d.
MSE 110 - UA • Aufbau principle for atoms with many electrons ATOMIC STRUCTURE Rules for filling orbitals: •Orbitals fill as per the “diagonal rule” (except for minor deviations at d and f levels) Order of filling: 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s …

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MSE 110 - UA Orbitals and the Periodic Table p s d f Full Shells •Aufbau’s principle dictates order of elements in table. 1s 2s 3s 4s 5s 6s 7s 2p 3p 4p 5p 6p 7p 3d 4d 5d 6d 4f 5f 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s …
MSE 110 - UA ATOMIC STRUCTURE Describing atomic/electronic structure Sulfur has 16 protons (some neutrons) and 16 electrons. How can we describe its atomic structure? Electronic Configuration : List orbitals with number of electrons in them. 1s 2 2s 2 2p 6 3s 2 3p x 2 3p y 1 3p z 1 Expanded: shows pairing of electrons 1s 2 2s 2 p 6 3s 2 p 4 Standard [Ne]3s 2 p 4 Condensed: Highlights the valence (outer shell) electrons

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MSE 110 - UA ATOMIC STRUCTURE Describing atomic/electronic structure Sulfur has 16 protons (some neutrons) and 16 electrons. How can we describe its atomic structure? Atomic Orbital Energy Diagram: Emphasizes electron energies • Draw lines for each orbital, note that s and p orbitals are slightly different in energy. Follow Hund’s rule!
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## This note was uploaded on 10/06/2009 for the course MSE 110 taught by Professor Lucas during the Spring '08 term at University of Arizona- Tucson.

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PROBLEM SET 3 - n=1 l=0 m=0 n=2 l=0 m=0 l=0 m=0 l=1...

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