Whose work directly resulted in the development of an atomic model that has negative electrons stuck within a sea of positive material?

J. J. Thomson’s experiments with cathode rays led him to propose the “plum pudding” model of the atom. In this model, negatively charged electrons are embedded in a spread-out sphere of positive material. Rutherford later showed that positive charge is concentrated in a nucleus, so the model described in the question is Thomson’s.

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