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CMY 716: L3 Exam Reported Reported Questions Well Answered.

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Draw the 2D space group/ lattice p3, p4 and c2 - correct answer summaries What are point groups - correct answer Each point group represents one of the possible unique combinations of crystallographic symmetry elements ...

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  • October 7, 2024
  • 2
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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CMY 716: L3

Draw the 2D space group/ lattice p3, p4 and c2 - correct answer summaries



What are point groups - correct answer Each point group represents one of the
possible unique combinations of crystallographic symmetry elements



How many molecular point groups are there? and why are there only 32 crystallographic ones? - correct
answer 1. There are an infinite amount of molecular point groups as Cn (rotation)
can go up to infinity

2. Crystallographic point groups do not have higher fold rotation axes (C6 max) as they are restricted to
the shape of the unit cell.



Describe and draw the point group 1 - correct answer 1. Triclinic

2. C1 (Schoenflies symbol i.e. molecular symmetry symbol) thus only identity



Describe and draw the point group 1 bar - correct answer 1. Triclinic

2. One bar meaning inversion centre

3. S2 rotoreflection hence generation of an enantiomer.

- NB! S2 is equivalent to an inversion centre!!

4. Schoenflies = Ci, S2



Axes for drawing triclinic systems - correct answer a = x, b = y and c comes out of
page



Describe and draw the point group 2 - correct answer 1. monoclinic

2. C2 rotation

3. Schoenflies = C2

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