Question

1 What is a possible quantum number set for an electron found in a ground-state helium (He) atom? (1, 1, 1, +½) (1, 1, 0, -½) (1, 0, 1, -½) (1, 0, 0, +½)

Answer 1

ground state of He:
principle QN, n = 1
azimuthal QN, l = 0
magnetic QN, m= 0
spin QN, s= +1/2 or -1/2
so the answer is (1,0,0,+1/2)