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In mineralogy and crystallography, a crystal structure is a unique arrangement of atoms or molecules in a crystalline liquid or solid.

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What are the structures of potassium superoxide and xenon hexafluoride?

Xenon hexafluoride's geometry is not easy to be described but it is assumed to be in $C_{3v}$-symmetry - not octahedral! - in gas phase which is supported by electron diffraction measurements and quan …
pH13 - Yet another Philipp's user avatar