IBr7
cannot exist but IF7 exist.
This fact can be explained
on the basis of
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The existence of IF7 and non-existence of IBr7 can be explained on the basis of electronegativity and the size of atoms.
- Fluorine is the most electronegative element in the periodic table.
- Moreover, its size is also very small.
- Due to this, it can form 7 bonds with iodine very easily and form IF7.
- On the other hand, the electronegativity of Bromine is very less as compared to fluorine.
- Also, the size of Bromine is very large.
- So, it experiences a lot of repulsion in making 7 bonds with iodine and thus cannot form IBr7 with iodine.
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