Which of the following rules states that an orbital can hold a maximum of two electrons?

For a $4p$-orbital,the number of radial and angular nodes,respectively,are

In a given atom,no two electrons can have the same values for all the four quantum numbers. This is called:

Which of the following statements concerning the four quantum numbers is false?

Find the exact orbital from the following for which $n=4$ and $l=1$.

The extra stability of half-filled subshells is due to:
$(A)$ Symmetrical distribution of electrons
$(B)$ Smaller coulombic repulsion energy
$(C)$ The presence of electrons with the same spin in non-degenerate orbitals
$(D)$ Larger exchange energy
$(E)$ Relatively smaller shielding of electrons by one another
Identify the correct statements.