ATOMIC THEORY SCIENTISTS

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Across
  1. 1. Niels Bohr worked under J.J Thomson who 15 years earlier discovered the _____.
  2. 3. all ____ was composed of atoms
  3. 4. name of J.J. Thomson’s atomic model(two words)
  4. 9. _____ lived in the time 460-370B.C.
  5. 10. First person to _____ the atom existed(3words)
  6. 11. Bohr's theory could explain why atoms emitted light in fixed __________.
  7. 12. all known _______ elements emit 2 kinds of radiation: positively and negatively charged, or alpha and beta.
  8. 16. What did Dalton call his model?(3words)
  9. 19. If the atom _______ energy, the electron jumped to a level further from the nucleus;if it radiated energy, it fell to a level closer to the nucleus.
  10. 20. This particle in the center that now has a neutral charge became known as the _______.
  11. 22. He started his famous ________ in around 1911
  12. 24. _________ have a negative charge and move in orbits of fixed size and energy
  13. 25. ______ did his famous experiment around 1897
  14. 27. the first possible way to experiment dalton’s theory
  15. 28. J.J Thomson demonstrated that cathode rays were ______ charged
  16. 34. who lived in between 1885 - 1962?(last name only)
  17. 35. What was the name of Rutherford's model called?(3words)
  18. 37. democritus was called
  19. 38. Rutherford did most of his major work at the University of ____
  20. 39. His famous experiment was called ______ experiment(3words
  21. 40. where Democritus lived in ______
  22. 42. Atoms cannot be_____, created, or destroyed.
  23. 43. expanded the atomic theory of____. dividing them; means eternity of existing nature of space and motion; density is proportional to the volume of an atom
  24. 44. CHADWICK-
  25. 45. JJ Thomson’s wife(two words)
  26. 50. In 1913, Niels Bohr proposed a theory for the hydrogen atom based on _______ that energy is transferred only in certain well defined quantities.(two words)
  27. 52. Rutherford met ______ (who would soon discover the electron), who encouraged him to study recently-discovered x-rays.(two words)
  28. 53. thomson was born in Cheetham hill, Manchester in what country?(2words)
  29. 54. who was born in Eaglesfield, Cumbria, Uk(last name only)
  30. 55. Rutherford discovered that ____ was composed of 2 different kinds of atoms, and proved the existence of isotopes in a stable element.
  31. 56. Compounds are formed by a _________ of 2 or more different kinds of atoms.
  32. 57. every radioactive element ______ in radioactivity over time
  33. 59. Rutherford was born in Brightwater,________(2words)
  34. 62. Bohr offered a place for many escaping ______ scientists to live and work after hitler took over germany.(religion)
  35. 63. who lived between 1871 - 1937(2words)
  36. 64. Atoms of a given element are ____ in size, mass, and other properties
  37. 65. James Chadwick was born in ______, UK
  38. 66. J.J. Thomson was born(3 different sets of numbers;month,day,year)
Down
  1. 2. Experiments with ______ (Crookes) tubes(two words)
  2. 5. Heisenberg was Most famous for his ______ ________ and theory of quantum mechanics which he published at the age of twenty-three in 1925. (two words)
  3. 6. the atom was believed to be composed of a _______ charged nucleus surrounded by negatively charged electrons.
  4. 7. Electrons should move around the nucleus but only in prescribed orbits. When jumping from one orbit to another with ______ energy, a light quantum is emitted.
  5. 8. who was born on 1932?
  6. 13. Elements are made of extremely small particles called _______.
  7. 14. which scientist contributed greatly to the making of the German atomic program during ww11?(last name only)
  8. 15. BOHR-
  9. 17. Bohr’s atomic model was called 3 things, the Rutherford-Bohr model, __________ and the Bohr diagram(two words)
  10. 18. John Dalton Discovered the _____ in 1803.
  11. 21. Rutherford discovered the atomic ____ and developed a model of the atom that was similar to the solar system.
  12. 23. RUTHERFORD-
  13. 26. John Dalton Published a book_____(two words)
  14. 29. Rutherford designed an experiment to use the alpha particles emitted by a radioactive element as probes to the unseen world of ________.(two words)
  15. 30. J.J. Thomson ______ 13 books and more than 200 papers in his lifetime.
  16. 31. discovered a way to formulate ___________ in terms of matrices.(2words)
  17. 32. James Chadwick _____ on July 24, 1974
  18. 33. Chadwick’s research went to the making of _______ explosions and nuclear energy. It helped a lot in WW11
  19. 36. who lived between 1901 - 1976?(2words)
  20. 41. THOMSON-
  21. 46. What country was Heisenberg born in?
  22. 47. Bohr proposed his quantized shell _______ of the atom to explain how electrons can have stable orbits around the nucleus.
  23. 48. He also ______ the atom in 1803
  24. 49. J.J thomson originally called these particles '______,' although they are now called electrons.
  25. 51. Chadwick could tell that the radiation was neutral because it was not deflected by electric or _____ fields and it did not invoke the photoelectric effect.
  26. 52. 1766-1844(two words)
  27. 56. J.J Thomson died in ________ on August 30, 1940
  28. 58. in the span of seven years, he published ___ papers.(8*10=?)
  29. 60. Niels Bohr was born in Copenhagen, ________(country)
  30. 61. HEISENBERG-
  31. 62. DALTON-