The number of nodal planes a $d$ orbital has is:

For the given quantum numbers $n$ and $l$ of electrons:
$(i) n = 4, l = 1$
$(ii) n = 4, l = 0$
$(iii) n = 3, l = 2$
$(iv) n = 3, l = 1$
Arrange them in the increasing order of their energy.

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

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

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

Number of unpaired electrons in the ground state of beryllium atom is