Symmetry Elements And Operations Flashcards
1
Q
Rotation axis
A
Cn
2
Q
Mirror planes
A
Vertical containing PRA and horizontal perpendicular to PRA
3
Q
Identity
A
E, indistinguishable
4
Q
Improper rotation
A
S, rotate and reflect
5
Q
Inversion centre
A
I, each point moves to inversion centre and then same distance through the other side
6
Q
C1
A
E only
7
Q
Cs
A
E and σ
8
Q
Ci
A
E and i
9
Q
Determine point group
A
Check if high/low symmetry
Find PRA
Check if C2 perpendicular to PRA, yes = D, no = C
σh = h in subscript
No σh but σv = v in subscript
No mirror planes = no letter
