Why iodine less reactive than chlorine

1.	Why iodine less reactive than chlorine
Answer» Chlorine has a higher effective nuclear charge, and therefore should be more oxidizing than iodine.The nuclear charge of chlorine is less shielded by intervening electrons. Thus chlorine gas should be a better oxidant.If we turn to reduction potentials, which we should do as scientists because scientists must utilize quantitative data, we find:1/2 Cl2+e−→Cl−E∘=1.361/2 I2+e−→I− E∘=0.54How is this consistent with the given proposition?

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