Chapter 4 Review 1. What are the three parts of an atom and what are their charges? 2. What is an atom? 3. What is an element? 4. What does the atomic number tell us? 5. How do you determine the number of neutrons in an atom? 6. What is an isotope? 7. What is an ionic bond? 8. What is a covalent bond? Directions: You may use your periodic table for the following questions. 1. For each element listed, identify the number of protons, neutrons, and electrons. Aluminum (Al) Tin (Sn) P_____________ N_____________ E_____________ P_____________ N_____________ E_____________ 2. For each element listed, draw the Bohr model. Additionally, identify the oxidation number of the element. List 2 examples of elements of that oxidation number with which it will bond to become stable. If it is already stable and would not bond with another element, write “stable.” Magnesium (Mg) Helium (He) Oxidation #_______ Oxidation #_________ Bonds with ox. #__________ Bonds with ox. #__________ Two examples:__________________________________ Two examples:_____________________________ __________________________________ __________________________________ 3. Happy or Unhappy? Fill in the chart below to determine if the compound is stable (happy) or unstable (unhappy). Chemical Formula Oxidation Numbers for (Compound) Each Element KOH AlO2 Sum of Oxidation Numbers Happy or Unhappy?