Plum Pudding Model Definition
An obsolete scientific model of the atom , devised shortly after the discovery of the electron but before the discovery of the atomic nucleus , and according to which the atom is composed of electrons surrounded by a soup of positive charge to balance the electrons' negative charges. It was disproved in 1909.
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Origin of Plum Pudding Model
The electrons are viewed as negatively-charged "plums" in a positively-charged "pudding".
From Wiktionary
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