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point group
set of symmetry elements/operations
molecules with the same set of symmetry elements belong to the same point group
role is to classify infinite number of molecules into relatively common “families”
point groups with mirror planes
Cnh, Cnv, Dnh, Dnd
point groups with no mirror planes
Cn, Dn
point groups of low symmetry
C1, Cs, Ci
point groups of high symetry
Cinfinity,v
Dinfinity,h
Td
Oh
Ih
D classification
nC2 axes perpendicular to the Cn principal axis of rotation
n-fold principal rotation axis PLUS n 2-fold rotation axes perpendicular to it
C classification
indicates only 1 rotational axis
