What is the lowest value of $n$ that allows $g$ orbitals to exist?

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

For a hydrogen atom,the orbital$(s)$ with the lowest energy is/are:
$A$. $4s$
$B$. $3p_x$
$C$. $3d_{x^2-y^2}$
$D$. $3d_{z^2}$
$E$. $4p_z$
Choose the correct answer from the options given below:

Which of the following sets of quantum numbers is not possible?

Which of the following represents the correct order of energy for the orbitals?

The atomic number of an element is $35$. What is the total number of electrons present in all the $p-$ orbitals of the ground state atom of that element?