atomic orbitals and shapes

Which type of orbital is shaped like a sphere?

Which of the following is NOT a possible pair of quantum numbers? 2p, 2d, 4p, 4f

What does the 1 in "1s" stand for?

Maximum number of electrons that can be placed in an s orbital.

Maximum number of electrons in a p orbital.

Maximum number of electrons in a d orbital. Options: 2, 6, 10, 14

The maximum number of electrons that can be placed in an f orbital. Options: 2, 6, 10, 14

Spherical orbital, also the lowest energy orbital. Options: s, p, d, f

This orbital fill after the s,  the shape is a dumbbell.  Options: s, p, d, f

What are the orbitals for n=4?