Consider value of all four quantum number of last electrons and magnetic moment and valence electron — Periodic Table and Periodicity Chemistry Question

Question

Consider value of all four quantum number of last electrons and magnetic moment and valence electrons of elements W, X, Y and Z in their ground state : W: n=3, l=0, m=0, s=+1/2, mag.mom=0, val.e-=2. X: n=3, l=1, m=+1, s=-1/2, mag.mom=sqrt(3), val.e-=3. Y: n=3, l=1, m=-1, s=+1/2, mag.mom=sqrt(15), val.e-=5. Z: n=3, l=1, m=0, s=-1/2, mag.mom=sqrt(8), val.e-=6. Then according to given information the correct statement(s) is/are :