>>11115003No clue about the electron radius, but there are 4 quantum numbers that describe an electron in an atom:
n, decides which energy level the electron is on (1,2,3,4...)
l, decides which orbital level the electron is on (s,p,d,f.....)
ml, decides which orbital the electron is in (Px, Py, Pz...)
ms, decides the spin of the electron (either +1/2 or -1/2)
So an electron with quantum numbers 3, 1, -1, +1/2 is an electron that is in the 3Px orbital with spin up.
