The first ionization energies of Si, P, S, and Cl are given in Table 9.4. Briefly provide an explanation for this trend.

Table 9.4

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TABLE 9.4 lonization Energies of the Third-Period Elements (in kJ mol-¹) Ar Si Na Mg First 495.8 737.7 Second 4,562 1,451 7,733 Third Fourth Fifth Sixth Seventh Al 577.6 1,817 2,745 11,580 786.5 1,577 3,232 4,356 16,090 PS 1,012 1,903 2,251 2,912 3,361 4,957 4,564 6,274 7,013 21,270 999.6 CI 1,251.1 2,297 2,666 3,822 3,931 1,520.5 5,158 5,771 6,542 7,238 8,496 9,362 8,781 27,110 11,020 12,000