9. As a general trend, as we go across a period we find that ionization energy increases. What is ionization energy. Explain why oxygen has a lower ionization energy than nitrogen. [/2 C] 10. Ball-and-stick model below shows the electron and molecular geometry of a generic molecule. Explain what is wrong with the molecular geometry and provide the correct molecular geometry, given the number of lone pairs and bonding groups on the central atom. [/3 A]