No. of nodal planes = 2
             ${\mathrm{d}}_{{\mathrm{x}}^2-{\mathrm{y}}^2}$ has even no. of nodal planes hence it is gerade (i.e. ψ_g )

             No. of nodal plane =1
             p_y has  odd no of nodal planes hence it is ungerade (i.e. ψ_u )

           No. of nodal plane = 0
           M.O. has even no of nodal planes hence it is gerade (i.e.ψ_g )

         No. of nodal plane = 2
         ${\mathrm{\pi }}_{2\mathrm{py}}^{*}$ has even no of nodal plane hence it is gerade (i.e. ψ_g )