Which of the following represents the correct set of four quantum numbers for a $4d$ electron?

The maximum number of electrons present in an orbit with azimuthal quantum number $l = 3$ is:

What is the atomic number of the element with the maximum number of unpaired $4p$ electrons?

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.

The relation between $n_m$ (the number of permissible values of magnetic quantum number $m$) for a given value of azimuthal quantum number $l$ is:

If the atomic number of element $X$ is $7,$ the best electron dot symbol for the element is