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Thomson was the first scientist to experimentally question
a. the existence of positive and negative particles within the atom.
b. the existence of a nucleus within the atom.
c. the existence of the atom.
d. the existence of neutrons.

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taskmasters
I think the correct answer from the choices listed above is option A. Thomson was the first scientist to experimentally question the existence of positive and negative particles within the atom. Hope this answers the question. Have a nice day. Feel free to ask more questions.

Answer: The correct answer is Option a.

Explanation:

J.J Thomson was a scientist who gave the existence of two subatomic particles which are protons (positive particles) and electrons (negative particles).

He proposed a model which was known as plum pudding model.

He considered atom to be a pudding or bed of positive charge in which negative particles are embedded such as plum on the pudding.

Hence, the correct answer is Option a.

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