7.47 Two atoms have the electron configurations 1s 2 2s 2 2p6 and 1s 2 2s 2 2p6 3s 1 . The first ionization energy of one is 2080 kJ/mol, and that of the other is 496 kJ/mol. Match each ionization energy with one of the given electron configurations. Justify your choice.

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Q: 7.85 Arrange the following isoelectronic species in order ofincreasing ionization energy: O2−, F−,…

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Q: Which element has the following ground-state electron configuration? [Xe]6s24f145d10

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