What is the second quantum number of the 3p1 electron in aluminum 1s22s22p63s23p1?

There are 4 quantum numbers that can be used to describe the space of highest probability an electron resides in.

First quantum number is the principal quantum number - n, states the energy level.

Second quantum number states the angular momentum quantum number - l,

states the subshell and the shape of the orbital

values of l for n energy shells are from 0 to n-1

third is magnetic quantum number - m, which tells the specific orbital.

fourth is spin quantum number - s - gives the spin of the electron in the orbital

here we are asked to find l for 3p1

n = 3

and values of l are 0,1 and 2

for p orbitals, l = 1

therefore second orbital for 3p¹ is 1.