Circle the most active element in the following pairs:
 

1. copper and iron

2. magnesium and barium

3. arsenic and nitrogen

Draw the electron dot diagrams for the following atoms:

4. uranium	5. magnesium
6. iodine	7. lead

Fill in the blanks in the following statements:

8. Metals generally have a _________________________ electron affinity.
 
9. The formula for a bromine molecule is _______________.
 
10. Atoms in a __________________________________ ion are covalently bonded.
 
11. Metals are good conductors because of their _______________________ bonding.
 
12. When carbon and oxygen combine, the bonding is mostly _____________
 
13. The energy needed to remove an electron from an atom is called ____________

14. ______________________________ OH⁻

15. ______________________________ BaCl₂

16. ______________________________ Cl₂

17. ______________________________ FeO

18. ______________________________ Ni₂P₃

19. ______________________________ FrCl

20. ______________________________ SO₄⁻²