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The postulates of J.J. Thomson are:

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An atom consists of a positively charged sphere with electrons embedded in it

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

An atom consists of a negatively charged sphere with electrons embedded in it

Both (1) & (2)

answer is D.

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Detailed Solution

● J.J.Thomson's two postulates were that an atom is a positively charged sphere with electrons contained in it, and that an atom is electrically neutral since both positive and negative charges have equal magnitude.

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