Periodicity<br />Notes<br />Group I elements (Alkali metals)<br /><ul><li>React with cold water to form hydroxides (alkali...
Eg. Li (s) + H20 (aq)  --> LiOH (g) + H2 (g)
Powerful reducing agents (they are oxidized)
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Periodicity

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Periodicity

  1. 1. Periodicity<br />Notes<br />Group I elements (Alkali metals)<br /><ul><li>React with cold water to form hydroxides (alkalis) and hydrogen gas
  2. 2. Eg. Li (s) + H20 (aq) --> LiOH (g) + H2 (g)
  3. 3. Powerful reducing agents (they are oxidized)
  4. 4. Eg. Li (s) ---> Li+ (aq)
  5. 5. Going down the group:</li></ul>PropertyTrendReasonReactivity (reducing power)IncreasingLose electrons more easilyMelting/boiling pointDecreasing Strength of metallic bonds decrease with atomic sizeDensityIncreasing Mass increases more than volume<br />Group VII elements (Halogens)<br /><ul><li>Exist as diatomic molecules
  6. 6. Powerful oxidizing agents (they are reduced)
  7. 7. Eg. Cl (g) ---> Cl- (aq)
  8. 8. Going down the group:</li></ul>PropertyTrendReasonReactivity (oxidizing power)DecreasingGain electrons less easilyMelting/boiling pointIncreasing Strength of van der Waals bonds increase with atomic size<br />Group 0 elements (Noble gases)<br /><ul><li>Exist as monatomic molecules
  9. 9. Highly unreactive (because of their stable octet configurations)
  10. 10. Low m.p. / b.p. that increase down the group</li></ul>Workout Questions<br /><ul><li>Element X is in Group VII and Period 5 of the periodic table. Which of the following is true?
  11. 11. It forms an amphoteric oxide
  12. 12. It is a good conductor of electricity in the molten state
  13. 13. It displaces chlorine from an aqueous chloride salt
  14. 14. It is displaced by chlorine from an aqueous chlorine salt
  15. 15. Element Y is directly above element Z in Group I of the periodic table. Which is correct?
  16. 16. Y is more reactive than Z
  17. 17. Z is more reactive than Y
  18. 18. They are equally reactive
  19. 19. It is impossible to deduce which is more reactive
  20. 20. Which of the following elements exist as diatomic molecules at room r.t.p.?
  21. 21. Neon
  22. 22. Sodium
  23. 23. Zinc
  24. 24. Nitrogen
  25. 25. Element P is monotomic and does not form ions. What can be deduced about P?
  26. 26. It is highly reactive
  27. 27. It is in Group I of the periodic table
  28. 28. It is in Group VII of the periodic table
  29. 29. It is highly unreactive
  30. 30. Which statement about groups in the periodic table is correct?
  31. 31. Moving down a group, the elements become increasingly metallic
  32. 32. Elements in the same group have the same number of electrons
  33. 33. Elements in the same group have the same level of reactivity
  34. 34. Moving down Group VII, the elements have increasingly higher boiling points
  35. 35. What happens when chlorine gas is bubbled into a solution of aqueous potassium bromide?
  36. 36. Brown gas is evolved
  37. 37. Purple gas is evolved
  38. 38. Bromine displaces chlorine
  39. 39. Chlorine displaces potassium
  40. 40. Which element is least likely to form an oxide?
  41. 41. Sodium
  42. 42. Zinc
  43. 43. Neon
  44. 44. Chlorine
  45. 45. Chlorine gas is bubbled into a solution of aqueous sodium bromide.
  46. 46. What is observed?
  47. 47. ________________________________________________________________________
  48. 48. ________________________________________________________________________
  49. 49. Write a balanced ionic equation with state symbols to show the reaction taking place.
  50. 50. ________________________________________________________________________
  51. 51. What is the name given to the type of reaction taking place?
  52. 52. ________________________________________________________________________
  53. 53. Going down the group, the boiling points for elements in group I decrease, whereas that for elements in group VII increase. Why is this so?
  54. 54. ______________________________________________________________________________
  55. 55. ______________________________________________________________________________
  56. 56. Going down the group, group I elements become more reactive, whereas group VII elements become less reactive. Why is this so?
  57. 57. ______________________________________________________________________________
  58. 58. ______________________________________________________________________________

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