Question

how chlorine is more reactive than iodine

Answer 1

Although the bromine nucleus is more positively charged than the chlorine nucleus, the increase in the radius and the extra shielding in the bromine atom outweigh this factor, which means that an electron is more easily attracted into the outer shell of a chlorine atom than that of a bromine atom, so chlorine is more ...hope it helped you.
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Answer 2

because chlorine is non-metal and gaeyish in a colour which had used as weapon in First World War and iodine is salt which we can eat

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