Question

Rotational axis cn for water molecule is ___________​

Answer 1

Explanation:

If rotation through an angle of 360°/n about an axis of symmetry leaves the molecule in an indistinguishable condition, it is said to have an n-fold axis of symmetry. The presence of this element is denoted as Cn.

If the molecule is rotated k times through 2π/n, Cnk indicates this operation. If Cn is applied n times, the molecule is again in the initial position, i.e. Cnn≡ E.

Answer 2

Answer:

the direction of the cn axiscis is take as vertical ,so a symmetry plane perpendicular to it is a horizontal plane.