List the symmetry elements of the following molecules, and name the point groups to which they belong (use models if you have them): Staggered...

I am in Quantum Mechanics and am having troubles with this question. Thank you very much for your help!!

1. List the symmetry elements of the following molecules, and name the point groups to which theybelong (use models if you have them): A. Staggered CH3CH3 B. Chair and boat cyclohexane C. B2H6 NOTE: B2H6 has a fimny bridged geometry, as shown in the figure.