Abelian meaning commutative. If the symmetry group of a square
is commutative then it's an abelian group or else it's not.
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D3h
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It's actually MOLLUSKS.
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C3v
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The Cs point group only has one symmetry plane. Cl2CH2 has two
symmetry planes and one C2 axis. The mirror plane is perpendicular
to the rotation axis, so this makes the point group C2h.