From the data in Figure 9-12, the formation of a gaseous anion Li^- appears energetically favorable. That is, energy is given off when gaseous Li atoms accept electrons. Comment on the likelihood of forming a stable compound containing the Li^- ion, such as Li⁺ Li^- or Na⁺ Li^-.

Figure 9-12

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First ionization energy, kJ mol-¹ 2500 2000 1500 1000 500 He Ne Li Na Ar K 10 20 30 Kr Rb Xe 1 40 Cs 1 50 60 Atomic number 70 80 Rn Fr I 90 100