Electron configuration of ions

Electron configuration of ions - Electron configuration of...

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Electron configuration of ions How does the energy released in lattice formation compare to the energy required to strip away another electron from the Na + ion? Since the Na + ion has a noble gas electron configuration, stripping away the next electron from this stable arrangement would take far more energy than what is released during lattice formation (Sodium I 2 = 4,560 kJ/mol). Thus, sodium is present in ionic compounds as Na + and not Na 2+ . Likewise, adding an electron to fill a valence shell (and achieve noble gas electron configuration) is exothermic or only slightly endothermic. To add an additional electron into a new subshell requires tremendous energy - more than the lattice energy. Thus, we find Cl - in ionic compounds, but not Cl 2- . Lattice energies range from around 700 kJ/mol to 4000 kJ/mol: Compound Lattice Energy (kJ/mol) LiF 1024 LiI 744 NaF 911 NaCl 788 NaI 693 KF 815 KBr 682 KI 641 MgF 2 2910 SrCl 2 2130 MgO 3938 This amount of energy can compensate for values as large as
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Electron configuration of ions - Electron configuration of...

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