 Water () is a bent molecule (105°) with C2v molecular symmetry.The possible orbital symmetries are listed in the table below.For example, an orbital of B1 symmetry (called a b1 orbital with a small b since it is a one-electron function) is multiplied by -1 under the symmetry operations C2 (rotation about the 2-fold rotation axis) and σv'(yz) (reflection in the molecular plane).