Inversion i

Inversion relates any position within space with one point which lies at equal distance on the prolongation of the connecting line line between the point and a centre of inversion. If, applied to a molecule, this operation yields an image with no differences to the original, the symmetry operation i for inversion is a feature in a classification of the molecule.

Among three molecules typical for inorganic chemistry, only the third possesses a centre of inversion.
 

I: SiF4
PDB
II: PF5
PDB
III: SF6
PDB

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