Particles Timeline by Maire Duffy https://padlet.com/maireduffy13/3al2cyd1fs705gmn From predictions to discoveries of particles en-us 2023-02-20 20:26:53 UTC 2025-09-24 11:51:00 UTC hello@padlet.com https://www.scienceabc.com/wp-content/uploads/2016/11/Quarks-1.jpg 440 BCE: Democritus' Atomic Theory maireduffy13 https://padlet.com/maireduffy13/3al2cyd1fs705gmn/wish/2488863627 2023-02-20 20:36:42 UTC https://padlet.com/maireduffy13/3al2cyd1fs705gmn/wish/2488863627 1803: John Dalton's Atomic Theory maireduffy13 https://padlet.com/maireduffy13/3al2cyd1fs705gmn/wish/2488875079 2023-02-20 20:56:21 UTC https://padlet.com/maireduffy13/3al2cyd1fs705gmn/wish/2488875079 1897: JJ Thompson discovers the electron maireduffy13 https://padlet.com/maireduffy13/3al2cyd1fs705gmn/wish/2488876742 2023-02-20 20:59:20 UTC https://padlet.com/maireduffy13/3al2cyd1fs705gmn/wish/2488876742 1909: Robert Millikan and the oil drop experiment. maireduffy13 https://padlet.com/maireduffy13/3al2cyd1fs705gmn/wish/2488881586 Measured the charge of an electron using oil droplets.
Investigate yourself by clicking the link.]]> 2023-02-20 21:08:36 UTC https://padlet.com/maireduffy13/3al2cyd1fs705gmn/wish/2488881586 1911: Ernest Rutherford's gold foil experiment. maireduffy13 https://padlet.com/maireduffy13/3al2cyd1fs705gmn/wish/2488884190 Most of the atom is empty space.
Nucleus is dense and positively charged.
The proton is discovered.
Try the PhET simulation link.

]]> 2023-02-20 21:14:14 UTC https://padlet.com/maireduffy13/3al2cyd1fs705gmn/wish/2488884190 1913: Niels Bohr's model of the atom maireduffy13 https://padlet.com/maireduffy13/3al2cyd1fs705gmn/wish/2488885787 2023-02-20 21:17:23 UTC https://padlet.com/maireduffy13/3al2cyd1fs705gmn/wish/2488885787 1920s: de Broglie, Schrodinger and Heisenberg's quantum mechanical model of the atom maireduffy13 https://padlet.com/maireduffy13/3al2cyd1fs705gmn/wish/2488894720 2023-02-20 21:35:09 UTC https://padlet.com/maireduffy13/3al2cyd1fs705gmn/wish/2488894720 1912: Cloud chamber invented by Charles TR Wilson. maireduffy13 https://padlet.com/maireduffy13/3al2cyd1fs705gmn/wish/2488901077 See how to build a cloud chamber in this video clip.]]> 2023-02-20 21:49:27 UTC https://padlet.com/maireduffy13/3al2cyd1fs705gmn/wish/2488901077 1932: James Chadwick discovers the neutron. maireduffy13 https://padlet.com/maireduffy13/3al2cyd1fs705gmn/wish/2488905139 2023-02-20 21:59:17 UTC https://padlet.com/maireduffy13/3al2cyd1fs705gmn/wish/2488905139 1928: Paul Dirac predicts anti-particles maireduffy13 https://padlet.com/maireduffy13/3al2cyd1fs705gmn/wish/2488909120 2023-02-20 22:08:26 UTC https://padlet.com/maireduffy13/3al2cyd1fs705gmn/wish/2488909120 1930: Wolfgang Pauli predicts the neutrino. maireduffy13 https://padlet.com/maireduffy13/3al2cyd1fs705gmn/wish/2488909819 2023-02-20 22:09:55 UTC https://padlet.com/maireduffy13/3al2cyd1fs705gmn/wish/2488909819 1932: Positron discovered (anti-particle of electron) by Carl Anderson. maireduffy13 https://padlet.com/maireduffy13/3al2cyd1fs705gmn/wish/2488910815 2023-02-20 22:12:02 UTC https://padlet.com/maireduffy13/3al2cyd1fs705gmn/wish/2488910815 1923: Photon discovered experimentally by Arthur Compton. maireduffy13 https://padlet.com/maireduffy13/3al2cyd1fs705gmn/wish/2488921055 He demonstrated the particle nature of electromagnetic radiation.]]> 2023-02-20 22:25:32 UTC https://padlet.com/maireduffy13/3al2cyd1fs705gmn/wish/2488921055 1937: Muon discovered by Carl D Anderson & Seth Neddermeyer. maireduffy13 https://padlet.com/maireduffy13/3al2cyd1fs705gmn/wish/2488928111 2023-02-20 22:30:56 UTC https://padlet.com/maireduffy13/3al2cyd1fs705gmn/wish/2488928111 1955: Antiproton discovered by Emilio Segre & Owen Chamberlain. maireduffy13 https://padlet.com/maireduffy13/3al2cyd1fs705gmn/wish/2488929904 Bombarded a copper target with high-energy protons from the proton synchrotron at the University of California.]]> 2023-02-20 22:34:49 UTC https://padlet.com/maireduffy13/3al2cyd1fs705gmn/wish/2488929904 1956: Electron neutrino discovered by Cowan and Reines. maireduffy13 https://padlet.com/maireduffy13/3al2cyd1fs705gmn/wish/2488933749 Detected in Los Alamos National Laboratory by observing inverse beta decay. ]]> 2023-02-20 22:43:13 UTC https://padlet.com/maireduffy13/3al2cyd1fs705gmn/wish/2488933749 1962: Muon neutrino discovered by Steinberger, Schwartz and Ledermann. maireduffy13 https://padlet.com/maireduffy13/3al2cyd1fs705gmn/wish/2488935735 Discovered in Brookhaven National Laboratory. 

]]> 2023-02-20 22:48:16 UTC https://padlet.com/maireduffy13/3al2cyd1fs705gmn/wish/2488935735 1969: Quarks discovered in the Stanford Linear Accelerator Center (SLAC). maireduffy13 https://padlet.com/maireduffy13/3al2cyd1fs705gmn/wish/2488937503 2023-02-20 22:52:15 UTC https://padlet.com/maireduffy13/3al2cyd1fs705gmn/wish/2488937503 1964: Murray Gell-Mann and George Zweig independently propose the existence of quarks. maireduffy13 https://padlet.com/maireduffy13/3al2cyd1fs705gmn/wish/2488937971 2023-02-20 22:53:35 UTC https://padlet.com/maireduffy13/3al2cyd1fs705gmn/wish/2488937971 1970: The Standard Model maireduffy13 https://padlet.com/maireduffy13/3al2cyd1fs705gmn/wish/2488939022 The discovery of particles rapidly increases from here.]]> 2023-02-20 22:56:11 UTC https://padlet.com/maireduffy13/3al2cyd1fs705gmn/wish/2488939022 maireduffy13 https://padlet.com/maireduffy13/3al2cyd1fs705gmn/wish/2488939629 2023-02-20 22:57:38 UTC https://padlet.com/maireduffy13/3al2cyd1fs705gmn/wish/2488939629 2012: 4th of July Higgs Boson discovered in CERN. maireduffy13 https://padlet.com/maireduffy13/3al2cyd1fs705gmn/wish/2488940690 2023-02-20 22:59:57 UTC https://padlet.com/maireduffy13/3al2cyd1fs705gmn/wish/2488940690 1964: Peter Higgs predicts the mass generating boson, later named the Higgs Boson. maireduffy13 https://padlet.com/maireduffy13/3al2cyd1fs705gmn/wish/2488941396 2023-02-20 23:01:29 UTC https://padlet.com/maireduffy13/3al2cyd1fs705gmn/wish/2488941396 Inside CERN, the world's largest particle accelerator. maireduffy13 https://padlet.com/maireduffy13/3al2cyd1fs705gmn/wish/2488944161 2023-02-20 23:07:47 UTC https://padlet.com/maireduffy13/3al2cyd1fs705gmn/wish/2488944161 2022: Pentaquarks and tetraquarks discovered in CERN. maireduffy13 https://padlet.com/maireduffy13/3al2cyd1fs705gmn/wish/2488944961 2023-02-20 23:09:45 UTC https://padlet.com/maireduffy13/3al2cyd1fs705gmn/wish/2488944961 1954: CERN established. maireduffy13 https://padlet.com/maireduffy13/3al2cyd1fs705gmn/wish/2488947788 Stroll through CERN!]]> 2023-02-20 23:15:24 UTC https://padlet.com/maireduffy13/3al2cyd1fs705gmn/wish/2488947788 1905: Einstein proposes the existence of discrete energy packets, later named photons, in his explanation of the photoelectric effect. maireduffy13 https://padlet.com/maireduffy13/3al2cyd1fs705gmn/wish/2488951723 Investigate the photoelectric effect using PhET.]]> 2023-02-20 23:24:26 UTC https://padlet.com/maireduffy13/3al2cyd1fs705gmn/wish/2488951723