Quantentheorie

Quantentheorie

Thomson's Atomic Model
Model by Studio Niesler, Berlin

Around the turn of the 19th/20th century it is recognized that there must be positive and negative charges in the atom. Thereupon, in 1903/04, Joseph John Thomson, the discoverer of the electron, develops one of the first modern atomic models: negatively charged electrons are distributed in a diffuse sphere with a positive charge: this is the so-called plum cake model.

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