Give the set of four quantum numbers that could represent the last electron added (using the Aufbau principle) to the Sr atom.
A) n = 5, l = 0, ml = 0, ms = -
B) n = 4, l = 1, ml = 1, ms = -
C) n = 5, l = 1, ml = 0, ms = +
D) n = 4, l = 1, ml = -1, ms = +
E) n = 5, l = 1, ml =1 , ms = -
Answer: A