1. Why is the Electron Affinity of chlorine more favorable (that is, more negative) than fluorine? This is surprising as fluorine is the most electronegative element. 2. The second Electron Affinity for oxygen is positive and very large, meaning it is unfavorable. But the most common ion of oxygen is oxide, O. How can you explain this, aside from using the octet rule? 3. Ammonia (NH3) has a greater dipole moment than nitrogen trifluoride (NF3). This means that ammonia is the more polar molecule even though the N-F bond is more polar than the N-H bond. Explain. 4. Four elements are named after the same town. What are the names of these elements (spelling must be correct!), and the name of the town?