Discovery of Electrons

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   In 1897, when Joseph John Thomson was studying the properties of cathode rays, he discovered that by placing two oppositely-charged electric plates around the cathode ray. The cathode ray will deflect away from the negatively-charged electric plate and towards the positively-charged plate. Therefore, it indicated that the cathode ray was composed of negatively-charged particles.  This particle was named: electron.  An electron is the negatively charged subatomic particle of an atom. They orbits around the shells of different energy levels.

Joseph John Thomson was born in Cheetham Hill on December 18, 1856.  He enrolled at Owens College Manchester, in 1870.  Thomson had an interest in atomic structure, he conducted a lot of lectures in the U.S about severals of his finding.  In his life time, he won Nobel Prizes such as: Nobel Prize in Physics and the Adams Prize in 1884.
Résultat de recherche d'images pour "cathode ray"















 His contribution to the atomic structure has inspired a lot of other scientist to do more research such as the finding of the protons.  Thank to this, people now knows that every atoms has electron and protons, but what differentiate them is the amount of each particle.

 MLA

J.J. Thomson, NobelPrize.org, Nobel Media AB 2018, Thu 8 Nov 2018, https://www.nobelprize.org/prizes/physics/1906/thomson/facts/

Khan Academy, Chemistry, Discovery of the electron and nucleus, 2016, https://www.khanacademy.org/science/chemistry/electronic-structure-of-atoms/history-of-atomic-structure/a/discovery-of-the-electron-and-nucleus

Whatls.com, TeachTarget, 2005, https://whatis.techtarget.com/definition/electron


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