What is the second quantum number of a #1s^2# electron in phosphorus #1s^2 2s^2 2p^6 3s^2 3p^3#?
As you know, four quantum numbers are used to describe the position and spin of an electron in an atom.
In your case, you want to know the value of the angular momentum quantum number,
As you can see, the angular momentum quantum number depends on the value of the principal quantum number,
The 1s-orbital is located on the first energy level, hence the number
#l = 0, 1, 2, ..., (n-1)" "#and #" "n = 1#
you will have only one possible value for
An s-orbital will always have