Question

the four quantum no for valence shell electron or last electron (Z=11)

A N=2 L=1 M=-1 S=-1/2

B N=3 L=0 M=0 S= +1/2

C N=3 L=0 M=-0 S=+-1/2

D N=3 L=2 M=2 S==1/2





please explain

Answer 1

b is correct the last electron enter in 3s1 n=3, for s, l=0, then m=0(l-1), spin quantum no. is +1/2