2.Spin angular momentum is also space quantized 2s+1=2,s=1/2 Spin magnetic quantum number m Like orbital magnetic quantum number m2=-l,-l+1,…,l-1,l m,=-s,+s=-1/2,+1/2 S,=m,=-2’+2 2s+1=2 , s=1/2 2. Spin angular momentum is also space quantized. Spin magnetic quantum number ms Like orbital magnetic quantum number ms= -s ，+ s = -1/2，+1/2