Explain the Thomson's Atomic Model


Thomson atomic model was proposed by William Thomson in the year 1900. This model explained the description of an inner structure of the atom theoretically. It was strongly supported by Sir Joseph Thomson, who had discovered the electron earlier.

Postulates of Thomson’s atomic model

1st postulate – An atom consists of a positively charged sphere with electrons embedded in it

2nd postulate – An atom as a whole is electrically neutral because the negative and positive charges are equal in magnitude

Thomson atomic model is compared to watermelon. Where he considered:

  • Watermelon seeds as negatively charged particles
  • The red part of the watermelon as positively charged

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