Atomic Theory Timeline by Hadley Keenen https://padlet.com/keenenh/vi277mhar7mmn1f4 en-us 2023-02-07 19:05:40 UTC 2023-02-07 23:01:02 UTC hello@padlet.com John Dalton - Dalton’s Model of the Atom - 1808 keenenh https://padlet.com/keenenh/vi277mhar7mmn1f4/wish/2472342062
  • The first person to be able to prove that matter was made up of tiny particles 
  • He imagined atoms as little indivisible spheres that could be arranged in different combinations to make other things
    • ]]>     2023-02-07 19:15:54 UTC https://padlet.com/keenenh/vi277mhar7mmn1f4/wish/2472342062     J.J. Thompson - Plum Pudding Model - 1904 keenenh https://padlet.com/keenenh/vi277mhar7mmn1f4/wish/2472352678
  • Discovered that atoms have electrons, and they are much smaller than atoms
  • Said that atoms are divisible and if you split one open you’d see the small electrons inside surrounded by a positively charged substance
  • He said that the negatively charged electron and positively charged substance around it balance out to created a neutral atom
    • ]]>     2023-02-07 19:22:53 UTC https://padlet.com/keenenh/vi277mhar7mmn1f4/wish/2472352678     Ernest Rutherford - Nuclear Model - 1911 keenenh https://padlet.com/keenenh/vi277mhar7mmn1f4/wish/2472357693
  • Discovered that atoms have a nucleus and that the positive charge was all in the center in the nucleus 
  • Said that besides the nucleus in the middle and the electrons roaming around, atoms are very empty
    • ]]>     2023-02-07 19:26:21 UTC https://padlet.com/keenenh/vi277mhar7mmn1f4/wish/2472357693     Niels Bohr - Bohr Model - 1913 keenenh https://padlet.com/keenenh/vi277mhar7mmn1f4/wish/2472359404
  • Said there was a nucleus, and the electrons circled and orbited around the nucleus 
  • Created the Bohr model
    • ]]>     2023-02-07 19:27:31 UTC https://padlet.com/keenenh/vi277mhar7mmn1f4/wish/2472359404     Erwin Schrödinger - Quantum Mechanical Model - 1920s keenenh https://padlet.com/keenenh/vi277mhar7mmn1f4/wish/2472562725
  • Discovered that electrons weren’t actually spinning in an orbit, they were more flying/buzzing around the atom making different shapes, which he called orbitals 
  • In 1919, protons were discovered and added to the Quantum Mechanical Model 
  • In 1932, neutrons were discovered and added to the Quantum Mechanical Model
  • This is a very accurate way to describe atoms
    • ]]>     2023-02-07 22:53:19 UTC https://padlet.com/keenenh/vi277mhar7mmn1f4/wish/2472562725