Prelab Questions 1. Where are the valence electrons in an atom? an the outermosts nel. 2. What is the overall charge of any ionic solid? 3. How do the names of ionic compounds differ from the names of covalent molecul 4. What is the formula for calcium chloride? for phosphorus tribromide? 5. What are polyatomic ions? What molecular shape has four bonds and no lone pairs of electrons originating central atom