Using the data in Figures 9.15 and 9.16, calculate E for the reaction Na(g) + Cl(g)

Using the data in Figures 9.15 and 9.16, calculate ΔE for the reaction Na(g)⁺ Cl(g) → Na⁺ (g)⁺ Cl^– (g).

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Trends in First lonization Energy Ionization energy (kJ/mol) 2500 2000. 1500- 1000- H 1312 0 Li 520 Na 496 Rb 403 Cs 500-376 K 419 Be 899 Mg 738 Ca 590 Sr 549 Ba 503 1A 2A B 801 Al 578 Ga 579 In 558 ΤΙ 589 3A 1086 P Si 1012 786 Ge 762 Sn 709 N 1402 1314 Pb 716 Cl S 1251 1000 As 947 941 Sb Te 834 869 F 1681 Se 1140 Bi Po 703 812 4A 5A 6A I 1008 Kr Br 1351 At 899 He 2372 7A Ne 2081 Ar 1521 Xe 1170 Rn 1037 8A Decreasing ionization energy Increasing ionization energy A FIGURE 9.15 Trends in lonization Energy First ionization energy increases as we move to the right across a period and decreases as we move down a column in the periodic table.