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Dear Charu

pure Iodine exists as I₂ molecules. Again, as you probably know, I₂ is non-polar, but even non-polar molecules exibit something called 'London Dispersion forces', where the electrons in the molecule temporarily become uneven, which then creates an unevenness in surrounding molecules which increases intermolecular attraction. London Dispersion forces are stronger in larger molecules, and Iodine is rather large. It's these London Dispersion forces that allow Iodine to exist as a solid.

 All the best.                                                          

AKASH GOYAL

AskiitiansExpert-IIT Delhi

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