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I'm having difficulty on drawing lewis dot structures for certain compounds and figuring out the molecular shape. I can do the simple ones like IO4- which is tetrahedral...but i'm stumped on ICl4-. When i drew the structure I thought it was octahedral, but my textbook says it's square planar. help?

I'm having similar problems with ICl2-. I put trigonal planar, when it was linear.

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  • Chemistry -

    ICl2- is Linear because the Cl bind at the top and bottom, and around the center there are 3 sets of Lone Pair Electrons. there is a negative sign, so you must add a set of LP electrons. So yes, Its Trigonal Bipyrmidal- if you go by the total electron density locations, but, its linear because the Cl atoms stay in linear formation with the 3 sets of LP electrons around center of the central I atom.

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