Welcome to the Electronic Learning Environment for the 21st century. This warm up will deal with various models beginning with John Dalton through the 20century. You can locate lecture notes on my science website, Mitchell's Cosmic Adventure.  I hope  you learn much information about the history of modern atomic theory.
   Good Luck!

5 Sample Questions

You may have seen diagrams of an atom that looks like a solar system with planets revolving around a sun. These diagrams are based upon the research of two scientists. Please choose those scientists from the list below.



  • A. Dalton, John
  • B. Thomson, J.J.
  • C. Rutherford, Ernest
  • D. Bohr, Niels
  • E. de Broglie, Louis
  • F. Schrodinger, Erwin
  • G. Chadwick, James

In _____ Hantaro Nagaoka, a Japanese physicst, suggested that an atom has a central nucleus. Electrons revolve in orbits like the rings around Saturn.

  • A. 1803
  • B. 1897
  • C. 1904
  • D. 1911
  • E. 1924
  • F. 1932

IN 1897 _____, a British scientist, discovers the electron leading to his "plum-pudding" model.


  • A. Dalton, John
  • B. Thomson, J.J.
  • C. Rutherford, Ernest
  • D. Curie, Maria
  • E. Chadwich, James

In _____, a Frenchman Louis deBroglie proposes that moving particles like electrons have some properties of waves.

  • A. 1803
  • B. 1897
  • C. 1904
  • D. 1911
  • E. 1924
  • F. 1932

Which one of the physicists used this apparatus in his laboratory that lead to the discovery of electrons?

  • A. Dalton, John
  • B. Curie, Maria
  • C. Nagaoka, Hantaro
  • D. Rutherford, Ernest
  • E. Thomson, J.J.

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