1188_Physics ProblemsTechnical Physics

1188_Physics ProblemsTechnical Physics - 529 Chapter 42...

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Chapter 42 529 Section 42.7 The Exclusion Principle and the Periodic Table P42.32 (a) 122 22 4 ssp (b) For the 1 s electrons, n = 1, A = 0, m A = 0, m s =+ 1 2 and 1 2 . For the two 2 s electrons, n = 2 , A = m A = m s 1 2 and 1 2 . For the four 2 p electrons, n = 2 ; A = 1; m A =− 1, 0, or 1; and m s 1 2 or 1 2 . P42.33 The 4 s subshell fills first , for potassium and calcium, before the 3 d subshell starts to fill for scandium through zinc. Thus, we would first suppose that Ar 3 4 42 ds would have lower energy than Ar 3 4 51 . But the latter has more unpaired spins, six instead of four, and Hund’s rule suggests that this could give the latter configuration lower energy. In fact it must, for Ar 3 4 is the ground state for chromium.
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This note was uploaded on 12/14/2011 for the course PHY 203 taught by Professor Staff during the Fall '11 term at Indiana State University .

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