Quantum Numbers — Prelims Questions

Which of the following sets of quantum numbers is NOT allowed for an electron in an atom?

What is the maximum number of electrons that can be accommodated in a subshell for which $n=3$ and $l=1$?

An electron is in a $4f$ orbital. What are the possible values for its principal, azimuthal, and magnetic quantum numbers?

How many orbitals are possible in the $n=3$ main energy shell?

Which quantum number primarily determines the shape of an atomic orbital?

What is the maximum number of electrons in an atom that can have the quantum numbers $n=3, l=2$?