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bus 12
It has 5 axes of symmetry
Not sure about a duodecagon, but a regular dodecagon has 12 axes of symmetry.
7. Selenium hexafluoride is SeF6 , an octahedral molecule similar to SF6
A regular pentagon has five axes of symmetry.
There are two different structures possible in an octahedral molecule with a formula of AX3Y3. The two structures are with each substituent atom in one plane of symmetry according to type, or having 2 in one and the other out.
3
12
5
8
0 if it is irregular, 8 if it is regular. Probably some numbers in between are possible, too.
5