J.R. S. answered 10/16/20
Ph.D. University Professor with 10+ years Tutoring Experience
n = 4 tells us it is the 4th shell
l = 1 tells us it is a p orbital
ml = 0 tells us which one of the 3 p orbitals it is. Since each can only hold 2 electrons, the maximum number of electrons for n = 4, l = 1, ml = 0 would be TWO ELECTRONS