Timeline of the Development of the atom

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Created by
Paola mendoza

Cards (20)

  • John Dalton
    What was his figure called?
    Billar ball model
  • John Dalton
    Why was his model better than those before?
    because it was more entailed than others, and it also explained evidence from his experiment.
  • John Dalton
    What did he determined about atoms and elements?
    All atoms of an element are identical
    Different elements contain different types of atoms
  • John Dalton
    Why could he not investigate atoms in detail?
    The technology at his time did not let him investigate atoms in detail.
  • John Dalton developed his atomic theory in 1803
  • J.J Thomson made his discovery in 1897
  • J.J Thomson What did he discover?

    The first subatomic particle, electron
  • J.J Thomson
    What did he find during hi experiments?
    he found that beam of cathode rays changed direction in electric and magnetic fields.
  • J.J Thomson
    What was his model called?
    Plum-pudding model
  • J.J Thomson
    What observation did the model have to make sense of?
    Atoms contain electrons
    Atoms are neutral overall
  • Whos model looked like this?
    Neil’s bohr
  • Neil’s Bohr
    What did he realise?
    Obriting electrons would be attached to the oppositely charged nuclei and would rapidly spiral inwards
  • Neil’s Bohr
    what did his model show?
    Electrons occupy fixed energy levels, or shells, around the nucleus.
  • Neil’s Bohr
    what year did he use mathematical models to improve rutherford’s atomic model?
    1913
  • Earnest Rutherford
    Who was he working wiht?
    Hens Geiger and Emest marsden
  • Earnest Rutherford
    What year did they test the plum pudding model?
    1909
  • Earnest Rutherford
    What was the model called?
    Planetary model
  • Earnest Rutherford
    What results did the actually get?
    Most go though the foil straight, some changed direction, some even came straight back
  • Earnest Rutherford
    Describe the experiment?
    they pointed beams of positively charged particles, called alpha particles, at thin gold foil
  • Earnest Rutherford
    What results did they expec?
    Particles to go though the foil