Which of the following is correct on the basis of Hund's rule but does not follow Pauli's principle?

The correct set of four quantum numbers for the valence electron of rubidium atom $(Z = 37)$ is

The number of electrons in the outermost shell of an element with atomic number $15$ is . . . . . . .

The subshell that arises after $f$ is called $g$ subshell.
$(a)$ How many $g$ orbitals are present in the $g$ subshell?
$(b)$ In what principal electronic shell would the $g$ subshell first occur and what is the total number of orbitals in this principal shell?

What is the maximum number of electrons accommodated in a subshell having azimuthal quantum number,$\ell=2$?

An orbital is defined as: