The total number of subshells for which $(n + l) = 7$ is .......

Explain how the energy of an orbital and the extent of shielding in the same shell depend on the shape of the orbitals.

The maximum number of orbitals present in $n=4$ energy level of an atom and the maximum number of electrons with spin value $+\frac{1}{2}$ in the same orbitals are, respectively.

For $n = 3$,what is the total number of orbitals and electrons present?

Which two factors affect the energy of an electron in an orbit? How?

For which of the following sets of four quantum numbers,an electron will have the highest energy?
$n$ $l$ $m$ $s$