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The description of the symmetry present in molecules. Molecular symmetry is useful for explaining or predicting of a molecule's chemical properties.

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Relationship between the symmetry number of a molecule as used in rotational spectroscopy an...

This is not in general true Consider molecules a point group not containing inversion symmetry, e.g. … Both the symmetry number and order of the group are 2. …
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How are there two C3 rotation axes in ammonia?

In the image below the two elements $C_3$ and $C_3^{-1}$ are the two symmetry elements of the $2C_3$ class, which are rotations about the same axis out of the plain of the image. … Symmetry elements of the $C_{3v}$ point group Image taken from Fig S5 in supplementary information of T. Karin, et al, Phys. Rev. B 94, 041201 …
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