A. (3,0,0,1/2) B. (4,0,0,0) C. (2,-1,0,-1/2) D. (3,3,1,-1/2)
A. Be<B<Na<Mg B<Be<Mg<Na C. Be<B<Mg<Na D. B<Be<Na<Mg
A. 6 B. 5 C. 4 D. 3