Q
Which statement best describes the arrangement of electrons in Thomson's atomic model?
RRB Technician Grade III, 06-Mar-26 S-2
2026
✓ Answer:
D
Electrons are embedded in a positively charged sphere.
Thomson's model, often called the 'Plum Pudding' or 'Watermelon' model, describes electrons as being embedded within a uniform positively charged sphere. The model suggests that the total negative charge of the embedded electrons is equal to the total positive charge of the sphere, making the atom as a whole electrically neutral. Unlike later models, Thomson's theory did not include a nucleus or moving electrons; instead, it envisioned them as stationary 'seeds' or 'plums' inside the 'fruit'. This was the first model proposed after the discovery of the electron by J.J. Thomson in 1897.
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