292. Find the element possessing the set of quantum numbers [5, l, -l, +l/2] for its last electron. 1) 31Ga 2) 47Ag 3) 50Sn 4) 81Tl 5) none of these ANS: 5 How is this problem correct? Ok primary quan number is 5 so 2^2=50 which make sense to be 3 right? since SN has 50 protons. and also 1 is the L then it means it has S and P orbitals that SN does have and -1 would mean Px. How is it None of the above?