The number of unpaired electrons in $1s^2 2s^2 2p^3$ is:

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

Which is the correct order of increasing energy of the listed orbitals in the atom of titanium? (At. no. $Z = 22$)

For the last electron entering the electronic configuration of potassium $(K)$,the values of $n, l,$ and $m$ are respectively .......

Which of the following combination of statements is true regarding the interpretation of the atomic orbitals?
$1$. An electron in an orbital of high angular momentum stays further away from the nucleus than an electron in an orbital of lower angular momentum.
$2$. For a given value of the principal quantum number,the size of the orbit is inversely proportional to the azimuthal quantum number.
$3$. According to wave mechanics,the ground state angular momentum is equal to $\frac{h}{2\pi}$.
$4$. The plot of $\Psi$ vs $r$ for various azimuthal quantum numbers shows peak shifting towards higher $r$ values.

The total spin of an iron $(Fe)$ atom is .......