The total magnetic moment m of an atom contains contributions from the magnetic moments mL, mS, and mI associated with the total electronic orbital angular momentum L, the total electronic spin angular momentum S, and the nuclear spin angular momentum I.
(a) For an atom with L, S, and I all nonzero, which one of these three contributions to m is by far the smallest?
(b) For the 87Rb ground electronic state (used in the Bose-Einstein condensation experiment of Section 10.5), which one of these three contributions is zero?