1. The identity operator E applies to each isomer.
2. Each isomer possesses a plane of symmetry which contains the molecular framework. However, their labels differ (see point 5 below).
3. The cis-isomer contains a C2 axis which lies in the plane of the molecule, but the trans-isomer contains a C2 axis which bisects the N_N bond and is perpendicular to the plane of the molecule.
4. The cis- (but not the trans-) isomer contains a mirrorplane, _v, lying perpendicular to the plane of the molecule and bisecting the N_N bond:
5. The consequence of the different types of C2 axes, and the presence of the _v plane in the cis-isomer, is that the symmetry planes containing the cis- and trans-N2F2 molecular frameworks are labelled _v’ and _h respectively