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Bromine has a SMALLER atomic radius because it has one more electron shell than Iodine. On the Periodic Table, atomic radius of an atom decreases across a period and increases down a group. Since Bromine and Iodine are in the same group, you know Bromine has a smaller atomic radius because it is in a lower period.

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9y ago
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Q: Why has bromine got a bigger atomic radius than iodine?
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