10. What represents the number of protons? 11. The horizontal rows on the periodic table are known as what?
12. The vertical columns on the periodic table are known as what?
13. Define the term isotope.
14. Give an example of an ionic compound and a covalent compound.
15. What 4 elements make up most of living things?
16. Contrast ionic and covalent bonds.
17. Draw an electron dot diagram for:
a. Fluorine (atomic number 9)
i. How many electrons are needed to fill the shells for this element?
b. Aluminum (atomic number 13)
i. How many electrons are needed to fill the shells for this element?
18. Write the chemical formula for the following:
A. Sodium chloride B. Potassium permanganate C. Magnesium Sulfate