How to distinguish cation and anion from Single XRD data?

07 December 2013 0 9K Report

Can anybody explain how to confirm cation and anion of any single crystal which is analysed for the first time by Single XRD? I mean from a CIF file? e.g if single crystal of NbSe2 is analysed, then which one is cation and which one is anion from Nb and Se element?

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