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    attempts to make ClF7 have failed but IF7 has been prepared.
    suggest an explanation for the existence of IF7 and for the non-existence of ClF7
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    (Original post by uzer)
    attempts to make ClF7 have failed but IF7 has been prepared.
    suggest an explanation for the existence of IF7 and for the non-existence of ClF7
    Iodine has 7 valence electrons, and Fluorine needs 1 more electron to complete its valence shell. Therefore, one Iodine can bond with 7 Fluorine atoms to form IF7.

    Carbon has 4 valence electrons. If it were the central atom, there wouldn't be enough electrons for the one Carbon atom to form bonds with the 8 other atoms, which all require 8 electrons in total to fill all valence shells. If Iodine were the central atom, there is still no possible way that all the valence shells could be filled.

    I feel that this is a shaky explanation (I tried), so I'll wait until someone else comes along and gives a better answer
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    (Original post by Necrosyrtes)
    Iodine has 7 valence electrons, and Fluorine needs 1 more electron to complete its valence shell. Therefore, one Iodine can bond with 7 Fluorine atoms to form IF7.

    Carbon has 4 valence electrons. If it were the central atom, there wouldn't be enough electrons for the one Carbon atom to form bonds with the 8 other atoms, which all require 8 electrons in total to fill all valence shells. If Iodine were the central atom, there is still no possible way that all the valence shells could be filled.

    I feel that this is a shaky explanation (I tried), so I'll wait until someone else comes along and gives a better answer
    sorry it is Cl as in chlorine sorry for the confusion
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    What exam board is this, I do edexcel and I've never seen that in my life :O
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    its cambridge as level
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    Just guessing but could it have anything to Do with the relative electronegativity of chlorine compared to iodine, which may prevent it "opening up" it's outershell.


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    The Cl atom is smaller than the I atom. Therefore it cannot facilitate the 7 Fluorine atoms but Iodine can because iodine has a larger atomic radius than Chlorine.
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    I actually think it as an IB question
 
 
 
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