1. Review TEST: ATOMS

2. 1. Which element does this atomic model represent? How can you tell?

3. 1. Iron—atomic number of 26

4. 2. What is the charge of this atom’s nucleus?

5. 2. + 38

6. 3. What 2 particles of this atom work together to form a neutrally charged atom?

7. 3. Protons (+) and electrons (-)

8. 4. Describe the particles that exist in this atom’s outer region.

9. 4. Negative electrons, mass=.001

10. 5. What is the charge of this atom’s cloud?—be specific!

11. 5. +18

12. 6. How many valence electrons does this model have?

13. 6. 3

14. 7. What is the overall charge of this atom’s center-most region?—its atomic number is 42!

15. 7. +42

16. 8. Tell me all you can about the particles that exist in the nucleus of this atom with the protons.

17. 8. Neutral neutrons, mass=1 AMU, there are 4 in lithium

18. 9. Identify this element

19. 9. carbon

20. 10. What is wrong with this model?

21. 10. Place both electrons in 1 st level

22. 11. How many valence electrons will a single atom of this element have?

23. 11. 3

24. 12. Will this element be stable/inert or reactive? How can you tell?

25. 12. Reactive…valence level not full!

26. 13. What particle in this atom gives it its identity?

27. 13. proton

28. 14. What is the overall charge of this atom? Why?

29. 14. Neutral…3-3=0

30. 15. Is this atom stable/inert? How can you tell?

31. 15. No valence shell is not full

32. 16. What element do I represent?

33. 16. carbon

34. 17. What element am I? Mass (amu)Atomic numberDensity (g/mL)# of valence electrons 18273254

35. 17. Tantalum Look back at the table!

36. 18. Without the electrons, what is the exact charge of this atom?

37. 18. -3…note the 3 electrons

38. 19. If we add 50 million neutrons to this atom, what will the overall charge be ?

39. 19. Still neutral

40. 20. If we take away an electron from this atom, what will its overall charge be?

41. 20. +1…now you have 1 more proton than you have electrons.

42. 21. Without the electrons, what is the exact charge of this atom?

43. 21. +3

44. 22. What will determine this substances reactivity?

45. 22. The number of valence electrons

46. 23. If we add 2 protons to this model, how will it be affected?

47. 23. It will become boron

48. 24. What is my identity?

49. 24. lithium

50. 25. If an atom has 3 electron energy levels that are all full, what would be the identity of the atom?

51. 25. argon

52. 26. If an atom has 4 protons, 5 neutrons, and 4 electrons, what would its atomic mass number be?

53. 26. beryllium

54. 27. Why is the electron cloud less massive than the nucleus even though it is larger—takes up more space?

55. 27. The electrons are so much lighter!=.001 AMU