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Thomson’s Model of an Atom

J. J. Thomson proposed that an atom was a solid sphere of positively charged material and the negatively charged particles, electrons, were embedded in it like the seeds in a watermelon.


Watermelon compared to Thomson model of an atom

Thomson compared the atomic model with watermelon. The red edible part of the watermelon is compared with the positive charge in the atom. The black seeds in the watermelon are compared with the electrons which are embedded on it.

Thomson stated that an atom consists of a sphere with positive charge. Electrons are embedded in that sphere.

The atom as a whole is electrically neutral since the negative and positive charges are equal in magnitude.

Although Thomson’s model explained that atoms are electrically neutral, this was proved wrong by the other scientists.

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