For the electronic configuration $1s^2 2s^2 2p^3$,what is the number of electrons having $n = 2, l = 1$,and $s = +1/2$?

Write about the subsidiary quantum number $(l)$.

What is the maximum number of electrons that can have a spin quantum number of $-1/2$ in the $4s$ orbital?

The set of orbitals filled just after the filling of electrons in an atom with atomic number $Z = 56$ is:

Consider the hypothetical situation where the azimuthal quantum number,$l$,takes values $0, 1, 2, \ldots, n+1$,where $n$ is the principal quantum number. Then,the element with atomic number

Which one of the following sets of quantum numbers represents the highest energy level in an atom?