Without referring to your text, predict the trend of second ionization energies for the elements sodium through argon. Compare your answer with the data in Table 12.6. Explain any differences.

Table 12.6

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Successive Ionization Energies in Kilojoules per Mole for the Elements in Period 3 General increase 13 14 -General decrease Element I₁ Na Mg Al Si P S Cl Ar 1₂ 4560 1445 7730 1815 2740 780 1575 3220 1060 1890 2905 1005 2260 3375 1255 2295 3850 1527 2665 3945 495 735 580 Is Core electrons* 11,600 4350 4950 4565 5160 5770 16,100 6270 6950 6560 7230 16 17 21,200 8490 27,000 9360 11,000 8780 12,000 *Note the large jump in ionization energy in going from removal of valence electrons to removal of core electrons.