Name:

1. What does a metal atom need to do in order to form a cation?

2. What is the octet rule and how is it applied to metal and nonmetal elements?
   

3. The electron configuration for arsenic (As) is  [Ar]4s³4p³. How many valance electrons does As
    have? Write the symbol for the ion of As that has a noble gas configuration.
   

4. Explain why magnesium forms Mg⁺² cations and not Mg^-6 anions.
   

5. Which of the following diagrams illustrates a potassium ion?

    Upper Left    Upper Right    Lower Left    Lower Right

6. Why do most ionic compounds have such high melting points?
   

7. Why can't an ionic bond form between potassium and magnesium?
   

8. Identify and name the cation and anion in each of the following ionic compounds:

9. Name the following ionic compounds:

    a. Cu₃(PO₄)₂

    b. Fe(NO₃)₃

    c. Cu₂O

    d. CuO

    e. AlPO₄

    f. SrSO₄

    g. KC₂H₃O₂

    h. CuS

10. Write formulas for the following ionic compounds (don't worry about subscripting. Just write the
      number):

    a. Lithium sulfate

    b. Strontium nitrate

    c. Ammonium acetate

    d. Titanium(III) sulfate

    e. Barium nitrate

    f. Calcium fluoride

    g. Potassium iodide

    h ammonium hydroxide

11. Determine the number of valance electrons in each of the following elements:

    a. Al

    b. Rb

    c. Si

    d. F

12. Compound B has a lower melting point and boiling point than compound A. At the same
     temperature, compound B vaporizes faster and to a greater extent than does compound A.
     If only one of these compounds is ionic, which one would you expect it to be? Why?
    

13. Name the following acids:
        H₃PO₄
        HI     
        HF     
        H₂CO₃

14. How many moles are there in 54 grams of Al?

15. How many atoms are there in 387 grams of arsenic?

11. How many molecules are there in 2.00 moles of sucrose, C12H₂₂O₁₁?

12. How many atoms are there in 1.25 x 10^-2 mol of mercury?

13. How many formula units are there in 3.12 moles of MgCl₂?

14. How many moles are the re in 2.50 x 10²⁵ formula units of MgO?

15. How many moles are there in 7.51 x 10²⁴ molecules of benzene, C₆H₆?

16. How many moles are there in 3.6 x 10²³ molecules of oxygen gas, O₂?

17. How many grams are there in 1.204 x 10²⁰ atoms of phosphorus?

18. How many grams are in 2.7 moles of table salt, NaCl?

19. How many atoms of gold are there in 10.6g of gold?

20. How many moles of sodium nitrate are there in a beaker that contains 0.500 kg of sodium
    nitrate?