The energy of orbitals in a hydrogen atom can be determined by which of the following quantum numbers?

The shape of an orbital is given by which quantum number?

The quantum numbers for the outermost electron of an element are given as $n = 2, l = 0, m = 0, s = +\frac{1}{2}$. The element is

The difference between the orbital angular momentum of an electron in a $4f$ orbital and another electron in a $4s$ orbital is

The five valence electrons of $P^{15}$ are labeled as $A, B, X, Y, Z$ as shown in the figure. If the spin quantum number of $B$ and $Z$ is $+\frac{1}{2}$,identify the group of electrons that share three identical quantum numbers.

Statement $A$: An orbital can accommodate a maximum of two electrons.
Reason $R$: Two electrons in an orbital produce opposite magnetic fields.