1. How many valence electrons are in an atom of magnesium?2 3 4 5

2. How many dots around a silicon atom in a Lewis Dot?2 4 6 8

3. What is the charge on the strontium ion?2- 1- 1+ 2+

4. What is the formula of the ion formed when potassium achieves noble-gas electron configuration?
K2+
K1+
K1-
K2-

5. Which of the following elements forms an ion with a charge of -1?
fluorine
hydrogen
potassium
sodium

6. How many electrons does nitrogen gain in order to achieve a noble-gas electron configuration?1 2 3 4

7. How does oxygen obey the octet rule when reacting to form compounds?
It gains electrons.
It gives up electrons.
It does not change its number of electrons.
Oxygen does not obey the octet rule.

8. What is the charge on each cation in the ionic compound sodium sulfide?1- 1 2 2-

9. What is the net charge of the ionic compound calcium fluoride?2- 1- 1

10. Which of the following is true about an ionic compound?
It is a salt.
It is held together by ionic bonds.
It is composed of anions and cations.
all of the above

11. How many valence electrons are transferred from the calcium atom to iodine in the formation of the compound calcium iodide? 1 2 3

12. What is the formula for the ionic compound sodium nitride?
Na3N
NaN3
Na2N2
NaN

13. What is the formula for aluminum oxide?
Al2O3
AlO3
Al3O2
AlO

14. What is the formula for potassium sulfide?
KS2
K2S2
K2S KS

15. How does titanium obey the octet rule when reacting to form compounds?
It gains electrons.
It gives up electrons.
It does not change its number of electrons.
Calcium does not obey the octet rule.

16. What is the charge of the anion in the ionic compound calcium sulfide?-1 1 2 -2

17. What is the charge of the cation in the ionic compound CaS?1- 1 2- 2+

18. What is the charge on each ammonium ion in Rb3N?3- 2- 1- 1+ 2+

19. What is the net charge of the ionic compound calcium fluoride?2- 1- 1

20. What is the formula for the ionic compound sodium nitrite?
Na3N3
Na3N
Na2N3
NaN3

21. What is the formula of iron(III) oxide?
FeO3
FeO
Fe2O3
Fe3O2

22. What is the formula for potassium sulfide?
K2S
K2S4
K4S2
K(SO4)2

23. What is the formula of the ion formed when potassium achieves noble-gas electron configuration?
K2+
K1+
K1-
K2-

24. Name the following compound: CaCl2
Calcium dichloride
Calcium (II) chloride
Calcium chloride
Calcium chlorine

25. What is the correct formula for magnesium chloride?
MgCl
Mg2Cl
MgCl2
Mg2Cl2

26. What is the correct formula for sodium phosphate?
NaP
NaPO4
Na3PO4
Na(PO4)3

27. How many valence electrons are in an atom of magnesium?2 3 4 5

28. How many valence electrons are in a silicon atom?2 4 6 8

29. How does calcium obey the octet rule when reacting to form compounds?
It gains electrons.
It gives up electrons.
It does not change its number of electrons.
Calcium does not obey the octet rule.

30. What is the electron configuration of the calcium ion?
1s22s22p63s2
1s22s22p63s23p6
1s22s22p63s23p64s2
1s22s22p63s23p24s2

31. What is the electron configuration of the sulfide ion?
1s22s22p63s23p6
1s22s22p63s23p2
1s22s22p63s23p4
1s22s22p63s6

32. What is the charge on the strontium ion?2- 1- 1+ 2+

33. What is the formula of the ion formed when potassium achieves noble-gas electron configuration?
K2+
K1+
K1-
K2-

34. Which of the following elements forms an ion with a charge of -1?
fluorine
hydrogen
potassium
sodium

35. How many electrons does nitrogen gain in order to achieve a noble-gas electron configuration?1 2 3 4

36. How does oxygen obey the octet rule when reacting to form compounds?
It gains electrons.
It gives up electrons.
It does not change its number of electrons.
Oxygen does not obey the octet rule.

37. What is the electron configuration of the oxide ion (O)?
1s22s2
1s22s22p2
1s22s22p4
1s22s22p6

38. What is the charge on the cation in the ionic compound sodium sulfide?-1 1 2 -2

39. What is the net charge of the ionic compound calcium fluoride?2- 1- 1

40. Which of the following is true about an ionic compound?
It is a salt.
It is held together by ionic bonds.
It is composed of anions and cations.
all of the above

41. How many valence electrons are transferred from the calcium atom to iodine in the formation of the compound calcium iodide? 1 2 3

42. What is the formula for the ionic compound sodium nitride?
Na3N
NaN3
Na2N2
NaN

43. What is the formula unit of aluminum oxide?
Al2O3
AlO3
Al3O2
AlO

44. What is the formula for potassium sulfide?
KS2
K2S2
K2S KS

45. An ionic bond is a bond between ____.
a cation and an anion
valence electrons and cations
the ions of two different metals
the ions of two different nonmetals

46. Write the formula for the compound barium oxide.

47. Write the formula for the compound rubidium phosphide.

48. Write the formula for the compound boron chloride.