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Why does ICl7 or IBr7 doesn't exist whereas IF7 exists?

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We know that in the periodic table Fluorine [ F = 3.98 ] is the most electronegative element. So it signifies that Fluorine only need 1 electron to fill it outermost shell and complete their stability.

So Fluorine can forms the bond by the Noble gases configuration of Iodine .

But on the other hand Chlorine and Bromine are not enough electronegative to achieve that much of stability and form stable bond with the noble gas configuration of iodine.

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