Which of the following orbitals does not have any directional properties?

Which of the following statements are correct for an electron that has $n = 4$ and $m = -2$?

The maximum number of electrons that can have the set of quantum numbers $n=4$,$m_l=0$,and $m_s=\frac{1}{2}$ is

Arrange the energy of the $2s$ orbital for hydrogen,lithium,sodium,and potassium in increasing order.

The quantum numbers of four electrons are given below:
$I. \ n = 4, l = 2, m_l = -2, m_s = -1/2$
$II. \ n = 3, l = 2, m_l = 1, m_s = +1/2$
$III. \ n = 4, l = 1, m_l = 0, m_s = +1/2$
$IV. \ n = 3, l = 1, m_l = 1, m_s = -1/2$
The correct order of their increasing energies will be:

What is the total number of orbitals present in $N$ shell?