The total number of unpaired electrons in $d$-orbitals of atoms of element of atomic number $29$ is

How many unpaired electrons are present in a carbon atom in its ground state?

The two electrons have the following set of quantum numbers:
$P = 3, 2, -2, +1/2$
$Q = 3, 0, 0, +1/2$
Which of the following statements is true?

The atomic numbers of elements $X, Y$ and $Z$ are $19, 21$ and $25$ respectively. The number of electrons present in the $M$-shell of these elements follow the order:

For $3d_{z^2}$ calculate the value of $n, \ell, m$ and $s$.

Arrange the following orbitals in increasing order of energy based on the given values of principal quantum number $(n)$ and azimuthal quantum number $(l)$:
$(1) n = 4, l = 1$
$(2) n = 4, l = 0$
$(3) n = 3, l = 1$
$(4) n = 3, l = 2$