The rule which states that an electron enters the sub-shell for which the $(n + l)$ value is minimum is known as:

Which one of the following sets of quantum numbers is incorrect?

Principal quantum number $(n)$	Azimuthal quantum number $(l)$	Magnetic quantum number $(m)$

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.

Which of the following shows half-filled configuration?

Match the entries in Column $I$ with the correctly related quantum number$(s)$ in Column $II$.

Column $I$	Column $II$
$A$. Orbital angular momentum of the electron in a hydrogen-like atomic orbital	$p$. Principal quantum number
$B$. $A$ hydrogen-like one-electron wave function obeying Pauli principle	$q$. Azimuthal quantum number
$C$. Shape,size and orientation of hydrogen-like atomic orbitals	$r$. Magnetic quantum number
$D$. Probability density of electron at the nucleus in hydrogen-like atom	$s$. Electron spin quantum number

The electrons,identified by quantum numbers $n$ and $l$ as $(i) n = 4, l = 1$,$(ii) n = 4, l = 0$,$(iii) n = 3, l = 2$,$(iv) n = 3, l = 1$,can be placed in order of increasing energy,from the lowest to highest,as: