How many electrons can fit in the orbital for which $n = 3$ and $l = 1$?

The minimum number of quantum numbers required to specify an orbital in an atom is

How many total orbitals are present in the $4f$ subshell?

Consider the following statements :
$(a)$ Electron density in the $xy$ plane in $3d_{x^2-y^2}$ orbital is zero.
$(b)$ Electron density in the $xy$ plane in $3d_{z^2}$ orbital is zero.
$(c)$ $2s$ orbital has one nodal surface.
$(d)$ For $2p_z$ orbital,$yz$ is the nodal plane.
Select the incorrect statements $:-$

The number of unpaired electrons in the $Fe^{2+}$ ion is

In an atom,the total number of electrons having quantum numbers $n=4$,$|m_{\ell}|=1$ and $m_s=-1/2$ is