The maximum number of electrons in a $P$ orbital with $n = 6$ and $m = 0$ is ......

The correct decreasing order of energy for the orbitals having the following set of quantum numbers:
$A$. $n=3, \ell=0, m=0$
$B$. $n=4, \ell=0, m=0$
$C$. $n=3, \ell=1, m=0$
$D$. $n=3, \ell=2, m=1$

In which of the following species,the ratio of $s$-electrons to $p$-electrons is the same?

Which of the following statements is $FALSE$?

What is the difference between the terms orbit and orbital?

For a one-electron atom,the set of allowed quantum numbers is