full transcript

From the Ted Talk by Shannon Odell: The most dangerous elements on the periodic table


Unscramble the Blue Letters


Some eltmnees are dangerous because of how they respond, react, or even explode in the outside environment. Top reactive elements reside in the first column of the periodic table and are known as alkali metals. They're rarely found in their pure eenmaletl form, as alalkis reilady donate the single electron in their outer sehll to whatever's around to form more stable ionic compounds. This can lead to vnoelit results— pure cesium, for example, bursts into flames when exposed to air, and explodes when dropped in water. Francium is likely the most rtcveiae alkali based on its position in the periodic table, but we don't know for sure. With a half-life of 22 minutes at most, it's thought that less than an ounce esxtis on Earth at any one time.

Open Cloze


Some ________ are dangerous because of how they respond, react, or even explode in the outside environment. Top reactive elements reside in the first column of the periodic table and are known as alkali metals. They're rarely found in their pure _________ form, as _______ _______ donate the single electron in their outer _____ to whatever's around to form more stable ionic compounds. This can lead to _______ results— pure cesium, for example, bursts into flames when exposed to air, and explodes when dropped in water. Francium is likely the most ________ alkali based on its position in the periodic table, but we don't know for sure. With a half-life of 22 minutes at most, it's thought that less than an ounce ______ on Earth at any one time.

Solution


  1. alkalis
  2. elemental
  3. elements
  4. reactive
  5. shell
  6. violent
  7. readily
  8. exists

Original Text


Some elements are dangerous because of how they respond, react, or even explode in the outside environment. Top reactive elements reside in the first column of the periodic table and are known as alkali metals. They're rarely found in their pure elemental form, as alkalis readily donate the single electron in their outer shell to whatever's around to form more stable ionic compounds. This can lead to violent results— pure cesium, for example, bursts into flames when exposed to air, and explodes when dropped in water. Francium is likely the most reactive alkali based on its position in the periodic table, but we don't know for sure. With a half-life of 22 minutes at most, it's thought that less than an ounce exists on Earth at any one time.

Frequently Occurring Word Combinations


ngrams of length 2

collocation frequency
small amount 2
periodic table 2



Important Words


  1. air
  2. alkali
  3. alkalis
  4. based
  5. bursts
  6. cesium
  7. column
  8. compounds
  9. dangerous
  10. donate
  11. dropped
  12. earth
  13. electron
  14. elemental
  15. elements
  16. environment
  17. exists
  18. explode
  19. explodes
  20. exposed
  21. flames
  22. form
  23. francium
  24. ionic
  25. lead
  26. metals
  27. minutes
  28. ounce
  29. outer
  30. periodic
  31. position
  32. pure
  33. rarely
  34. react
  35. reactive
  36. readily
  37. reside
  38. respond
  39. shell
  40. single
  41. stable
  42. table
  43. thought
  44. time
  45. top
  46. violent
  47. water