The outer electronic structure $3s^23p^5$ is possessed by

The number of nodal planes a $d$ orbital has is:

Calculate the value of $(n + l)$ for the $3d$ orbital.

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.

Magnetic and spin quantum number of an electron are $-1$ and $+1/2$ respectively. This electron cannot be in

Which of the following electronic configurations has the least energy?