Chadwick's Discovery of the Neutron

Faced with utter confusion over 2 different masses of neon, what did James Chadwick do? He discovered a new particle: The Neutron. With the help of JJ Thomson and Francis Aston's early mass spectrometry (mass spectrograph), Chadwick performed groundbreaking radioactive experiments to discover the neutron.

0:00 Early Mass Spec (Mass Spectrograph) Experiments
2:10 Puzzle of Neon's 2 Masses
2:47 What We Already Knew About Atomic Structure
3:18 Mysterious Gamma Radiation
4:26 Chadwick's Experimental Set-Up
6:35 Discovery of the Neutron
7:20 Neon's 2 Masses Explained

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Citations:
https://theanalyticalscientist.com/is...
https://openstax.org/books/chemistry-...

Images:
By Not Mentioned - First World War.com, Public Domain, https://commons.wikimedia.org/w/index...
By Unknown author - http://www.nobelprize.org/nobel_prize..., Public Domain, https://commons.wikimedia.org/w/index...
By Francis William Aston - "Positive Ray Parabolas". Isotopes. London, England: Edward Arnold Publishers Ltd, 1922. Digital file made available by Science History Institute, at https://digital.sciencehistory.org/wo..., Public Domain, https://commons.wikimedia.org/w/index...
By The original uploader was Den fjättrade ankan at Swedish Wikipedia. - Källa:Dmitrij Ivanovitj Mendelejev (1834 - 1907). Originally from sv.wikipedia; description page is/was here., Public Domain, https://commons.wikimedia.org/w/index...
James Chadwick Photo, https://commons.wikimedia.org/wiki/Fi... Unless otherwise indicated, this information has been authored by an employee or employees of the Los Alamos National Security, LLC (LANS), operator of the Los Alamos National Laboratory under Contract No. DE-AC52-06NA25396 with the U.S. Department of Energy. The U.S. Government has rights to use, reproduce, and distribute this information. The public may copy and use this information without charge, provided that this Notice and any statement of authorship are reproduced on all copies. Neither the Government nor LANS makes any warranty, express or implied, or assumes any liability or responsibility for the use of this information.
Periodic Table used with permission from https://sciencenotes.org/printable-pe...

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