Which of the following orbitals represents $3d_{z^2}$ orbitals?

The electronic configuration of three elements $A$,$B$,and $C$ are given below. Stable form of $A$ may be represented by the formula:
$A : 1s^2, 2s^2, 2p^6$
$B : 1s^2, 2s^2, 2p^6, 3s^2, 3p^3$
$C : 1s^2, 2s^2, 2p^6, 3s^2, 3p^5$

The four quantum numbers for the unpaired electron of chlorine $(Cl)$ are:

The maximum number of electrons in an atom with $l = 2$ and $n = 3$ is

The maximum number of electrons in a subshell of an atom is given by ...........

The radial part of the wave function is determined by which quantum numbers?