4. What is the first ionization energy for a hydrogen atom in the ground state? The Rydberg constant is . (A)(B) (C)(D) 0.00823

9. The MO diagram below is appropriate for B2 (Boron atom), Based on this diagram, B2 (A)has a bond order of one and is diamagnetic. (B) has a bond order of one and is paramagnetic. (C) has a bond order of two and is diamagnetic. (D) has a bond order of two and is paramagnetic.