Only iodine forms hepta-fluoride $IF_7$,but chlorine and bromine give penta-fluorides. The reason for this is:
- Alow electron affinity of iodine
- Bunusual pentagonal bipyramidal structure of $IF_7$
- Cthat the larger iodine atom can accommodate more number of smaller fluorine atoms around it
- Dlow chemical reactivity of $IF_7$
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