Discovery of electron
J.J. Thomson measured e/m of a “tinynegatively charged particle”, 1897R. Millikan measured e, 1910 and Planck’sconstant in 1912-1915 The first discovered particle! – quiteelementary until todayStructure? The major experimental
facts:1. the periodic table of elements – DmitriMendeleev, 18692. the stable matter is electrically neutralMajor hypothesis (J.J. Thomson):
Positively charged spheres orbited byelectrons – from the side raisin puddingpositively charged stuff (pudding) stuffedwith electrons – raisin.
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