Question

Which of the following orbitals is non-directional?

• A. s
• B. p
• C. d
• D. All of the above

Answer 1

The correct option is A s

s orbital is spherical, so it is non-directional in nature.
p orbital is dumbbell shaped and has the directionality associated with it ( $p_x$ , $p_y$ , $p_z$ ).
d orbitals are double dumbell shaped (except $d_{z^2}$, which has lobes in the z direction and high electron density ring in xy plane). d orbitals are also directional.
The five d orbitals are $d_{xy}$, $d_{yz}$, $d_{zx}$, $d_{x^2-y^2}$, $d_{z^2}$.