Which of the following elements has a half-filled valence shell?

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

In any atom,which sub-shell will have the highest energy among the following?

The electrons identified by quantum numbers $n$ and $l$ :
$A. n=4, l=1$ $B. n=4, l=0$
$C. n=3, l=2$ $D. n=3, l=1$
can be placed in order of increasing energy as :

Match List-$I$ with List-$II$.

List-$I$ (Quantum Number)	List-$II$ (Information provided)
$A$. $m_l$	$I$. Shape of orbital
$B$. $m_s$	$II$. Size of orbital
$C$. $l$	$III$. Orientation of orbital
$D$. $n$	$IV$. Orientation of spin of electron

Choose the correct answer from the options given below:

Which of the following orbitals has/have zero probability of finding the electron in the $xy$ plane?