Unlike other sub-orbitals, the s-orbitals do not have subsets.
The s-orbitals are spherical in shape, like a round ball.
Number of electrons in an S-orbital
S-orbitals can hold two electrons.
S-orbitals in Each Shell
Every shell contains an s-orbital. As you can see below, the spheres increase in diameter with each shell. This is because the electrons in sub-orbitals closer to the nucleus repel those electrons in the outer sub-orbitals.
|1S orbital||2S orbital|
|3S orbital||4S orbital|