How many values of magnetic quantum number are possible for each value of azimuthal quantum number?

The number of $d$ electrons in $Fe$ is equal to which of the following?
$i$. Total number of '$s$' electrons of $Mg$
$ii$. Total number of '$p$' electrons of $Cl$
$iii$. Total number of '$p$' electrons of $Ne$
The correct option is

The maximum number of electrons that can be filled in the shell with the principal quantum number $n=3$ is

The orbital angular momentum for a $d$-electron is

For which of the following orbitals is the value of $(n + l)$ maximum?

The maximum number of orbitals present in $n=4$ energy level of an atom and the maximum number of electrons with spin value $+\frac{1}{2}$ in the same orbitals are, respectively.