hw3sol - H omework #3 Solutions From the text: 3.091 Fall...

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3.091 Fall Term 2004 Homework #3 Solutions From the text: 3-84. Mg. The energies are given in Table 3.5. 3-85. (a) The first 18 electrons for K are found in the 1s 2 , 2s 2 , 2p 6 , 3s 2 , and 3p 6 shells. This is also the order of decreasing ionization energies. The relative intensities for the p electrons would be 3 times as large as the s electrons. (b) Within a given shell, it is expected that the energies to remove electrons are quite similar. Therefore, if the 19 th electron were in an n = 4 shell, the ionization energy would be substantially different because the electrons are further from the nucleus. This can be seen by comparing the relative ionization energies for the different shells in Na and Li. The ionization energy would be closest to 0.42 MJ/mol. (c) Within a given shell, it is expected that the energies to remove electrons are quite similar. Therefore, if the 19 th electron were in an n = 3 shell, the energy would be close to but slightly larger than the 1.52 MJ/mole found for Ar. The ionization energy would be closest to 2.0 MJ/mole. (d) There is a drop in energy from a grouping of 3.93 MJ/mole and 2.38 MJ/mole to
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hw3sol - H omework #3 Solutions From the text: 3.091 Fall...

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