Shape of s-orbitals in 3D

An illustration of the shape of the 1s, 2s and 3s orbitals

The s sub shell can hold a maximum of two electrons as there is only one orbital. S orbitals are spherical in shape and increase in size as the energy level or shell increases.

s-orbitals |2p-orbitals |3p-orbitals | 3d-orbitals | 4f-orbitals

Comparison of 1s, 2s and 2p-orbitals