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Chlorine (Cl) has the largest first ionization energy among the elements listed (Sb, Se, Cl, and Pb). Ionization energy tends to increase across a period and decrease down a group in the Periodic Table. Since Cl is located in the second period and is further right compared to the others, it has a higher ionization energy than antimony (Sb), selenium (Se), and lead (Pb).

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2d ago

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