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Symmetry - Rotations (Cn)


Symmetry operations are operations that leave the molecule apparently unchanged. In each molecule there can be any number or none of these:

Rotations (Cn)

These are rotations about the axes of symmetry. n denotes 360º divided by the number for the rotation.

For example

C2 = 180º
C3 = 120º
C4 = 90º
C5 = 72º
C6 = 60º


Other types of Symmetry Operations
Improper rotations (Sn) Inversion centre (i) Reflections (sh, sd and sv) Identity operation (E)