2. Expression that shows number & type of atoms in a compound is called___________________________________________

3. The number that shows how many atoms of an element are in a compound is called _____________________________

4. Metals tend to form _____________ ions & nonmetals _______________ ions.

5. Draw Lewis Structure:

6. Mg

7. Cl

8. S

9. Ar

10. Hoy many electrons will each element los or gai n forming an ion? Write the symbol.

11. Ca Lose 2 Ca2+

12. Al ______ ______

13. P _______ ______

14. F _______ ______

15. Indicate how many atoms of each element are present in the following compounds:

16. Ba (NO3)2 Ba=_____ N=______ O=_______

17. Al2(Cr2O7)3 Al=______ Cr=_____ O=_______

18. Ionic bonds are formed when atoms _________ electrons. (share or transfer9

19. Name the following ionic compounds:

20. Na2S

21. Ca3P2

22. MgBr2

23. BeCl2

24. Write the chemical formula.

25. Potassium nitride

26. Lithium Oxide

27. Barium Iodide

28. Cesium fluoride

29. Which pair of elements is likely to form ionic compounds? (should be metal & nonmetal) write yes or no

30. Cl & Br ________

31. K & He ________

32. I & Na ________

33. Li & F ________

34. Which of the following is NOT ionic?

35. CaS ______

36. NH3

37. Na2O

38. Cl2O7