How is an electron in an atom identified? State the parameters used.

The electrons,identified by quantum numbers $n$ and $l$ as $(i) n = 4, l = 1$,$(ii) n = 4, l = 0$,$(iii) n = 3, l = 2$,$(iv) n = 3, l = 1$,can be placed in order of increasing energy,from the lowest to highest,as:

Write down about the electron spin quantum number $(s)$.

Which of the following statements is $FALSE$?

The principal quantum number of an atom is related to the:

Which one is the electronic configuration of $Fe^{2+}$?