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I think there are examples were chlorine is in the center of the lewis structure, i.e. ClH4 were Cl will be in the middle surrounded by hydrogen. However, in most examples I have seen fluorine has not been the central atom. I think this has to do with reasoning that Cl and F only need one more valence electron to achieve in octet.
The central atom is restricted to the element that has the lowest ionization energy. Fluorine (as far as I know) has the highest ionization energy, so whatever element that has a higher ionization energy than Fluorine would allow Fluorine to be the central atom.
Also, in general, if there is a problem that asks you to draw the Lewis Structure for a molecule, the element in the middle of the molecular formula normally actually IS the element in the middle. Of course, this doesn't work all the time, and that's where checking electronegativity is important, but if you're looking for a shortcut, there it is :)
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