For a given value of quantum number $l$,the number of allowed values of $m$ is given by

The electronic configuration of neon is

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

The quantum numbers $n$ and $l$ for four electrons are given as: $(1) \, n = 4, l = 1; \, (2) \, n = 4, l = 0; \, (3) \, n = 3, l = 2; \, (4) \, n = 3, l = 1$. Arrange them in increasing order of their energy.

Which one is a wrong statement?

In an atom,the total number of electrons having quantum numbers $n=4, |m_{l}|=1$ and $m_{s}=-\frac{1}{2}$ is: