Which of the following molecular/atomic orbitals have gerade symmetry or center of symmetry?

Orbitals with a center of symmetry have even (gerade) symmetry with respect to inversion, i.e. if the coordinates are inverted so that (x,y,z)→(−x,−y,−z), the orbital is coincident with itself exactly.Orbitals without such a thing have odd (ungerade) symmetry with respect to inversion.

• s orbitals are gerade
• p orbitals are ungerade orbitals are ungerade
• d orbitals are gerade
• f orbitals are ungerade

• 
  d orbitals are gerade