Thomson compared the spread of positive charge within an atom to the edible red part of a watermelon, suggesting it was spread throughout the atom.
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Thomson likened the structure of an atom to a Christmas pudding, where electrons were compared to currants embedded within a positively charged sphere.
Understanding the arrangement of electrons and protons within an atom was necessary to develop a more accurate model of atomic structure and explain various chemical phenomena.
Thomson’s model proposed that atoms were composed of positively charged matter with negatively charged electrons embedded within, resembling a “plum pudding” structure.
The discovery of electrons and protons inside the atom led to the failure of Dalton’s idea.