IHCC 21 juniors round 1

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Across
  1. 2. a transition metal
  2. 4. proton donor
  3. 6. name of scientist who came up with Atomic theory
  4. 8. a polymer which has identical sub units
  5. 11. not a metal or a non metal and used in making computer chips
  6. 12. light weight causing me to escape the atmosphere
  7. 13. tested with a glowing splint
  8. 15. only halide which is liquid
  9. 17. hydrogen concentration of Milk
  10. 19. acid base reaction
  11. 20. An alloy of 2 elements
  12. 22. what kind of gases are hydrogen nitrogen and oxygen
  13. 23. a metal which sinks in water
  14. 28. radioactive transition metal
  15. 30. element which causes acid rain
  16. 32. negatively charged subatomic particle
  17. 33. a macromolecule which is an allotrope of hydrocarbon
  18. 35. most electronegative element
  19. 36. solid which does not have crystalline structure
  20. 37. substances formed in the middle step of a reaction
  21. 39. one of the most precise lab equipments
  22. 40. silver white metal that reacts explosively
  23. 41. exothermic reaction
  24. 44. elements which have properties of both metals and non metals
  25. 45. method for purification
  26. 46. an anion which contains the element oxygen
  27. 47. modern name for the element Stibnite
Down
  1. 1. black oxide compound
  2. 3. devise used to measure gas pressure
  3. 4. elements 90 through 103
  4. 5. metal that is liquid at rtm
  5. 7. cause water life to die
  6. 9. species that has the same electronic structure
  7. 10. discrete packet of matter
  8. 14. lab equipment used for only certain values
  9. 15. seperation of electric charges along the bond
  10. 16. sometimes used as a poison
  11. 18. removes harmful gases from cars
  12. 21. element which is not a liquid at room temperature
  13. 24. name of scientist who discovered the periodic table
  14. 25. compounds which contain only hydrogen and carbon
  15. 26. substances with the same chemical properties but different physical properties
  16. 27. vertical columns in the periodic table are called
  17. 29. elements are listed in the periodic table in order of what atomic number
  18. 31. highly toxic and soluble compound
  19. 34. direct conversion of solid to gas
  20. 38. 2 atoms in the plane
  21. 42. first column of metal called
  22. 43. formed by losing electrons