Identity

Simplest symmetry operation. All molecules have this element. If the molecule does have no other elements, it is asymmetric. It does nothing to the molecules.

Examples:
CHFClBr - has only "E". There is no other symmetry operations.
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Acetone - C3H6O has E but has also other symmetry operations. Be careful; if a molecule has E doesn't mean it has only E.
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