The [Ru(en)2]2+ ion belongs to the D3 point group. In this point group, the d-orbitals split into two sets in a trigonal bipyramidal field: the a1' set (dz^2) and the e' set (dx^2-y^2, dxy, dxz, dyz). The e' set is further split into e'(dx^2-y^2, dxy) and e''(dxz, dyz) in a C3v field. / Why