Lec-13-Chap-07-4 - CHE 131 Lecture 13, 2/20/2006 Electron...

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CHE 131 Lecture 13, 2/20/2006 1 Electron Configurations Lecture thirteen (Chapter seven) Benjamin S. Hsiao Department of Chemistry Stony Brook University Electronic Configurations The shorthand representation of the occupancy of the energy levels (shells and subshells) of an atom by electrons. E 0 n = 1 n = 2 A one electron atom 1s 2s 2p A multi electron atom E 0 -E 0 0 /4 0 /9 0 /16 n = 1 n = 2 n = 3 n = 4 s orbitals l = 0 E = - E 0 n 2 Z 2 1s 2s 3s
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CHE 131 Lecture 13, 2/20/2006 2 Electron density plots for the 1s, 2s, and 3s atomic orbitals of the hydrogen atom. The vertical lines indicate the values of r where the 90% contour surface would be located. 1s 2p 2s 3p When a free electron approaches a He + cation, it is attracted to the +2 charge on the nucleus but repelled by the –1 charge on the 1s electron. When it is far from the cation, the electron experiences a net charge of +1. Electron density plots for the 1s, 2s, and 2p orbitals. Unlike the 2p orbital,the 2s orbital has significant electron density very near the nucleus (shaded region).
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This note was uploaded on 09/04/2009 for the course CHE 81914-01 taught by Professor Prof.benjaminhsiao during the Spring '06 term at SUNY Stony Brook.

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Lec-13-Chap-07-4 - CHE 131 Lecture 13, 2/20/2006 Electron...

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