Posted by Steve Simon on June 1, 2014, 4:40 pm, in reply to "X-ray scattering"
Very good point! The truth usually lies somewhere in between! Yes, you are right that for a very ionic bond (like NaF) the last Na electron is really mostly on the F.
Note, however, that the approximation that the structure factor is exactly proportional to Z is only rough anyway -- as there are form factors etc to worry about. So worrying about a +1 or -1 here and there probably is not so crucial.
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