Which of the following answer choices best describes J. J. Thomson's plum-pudding model?An atom is surrounded by a firm outer shell and contains positively charged particles in its core. An atom is surrounded by a firm outer shell and contains negatively charged particles in its core. An atom consists of positively charged matter that contains negatively charged particles. An atom consists of negatively charged matter that contains positively charged particles.

The statement that best describes J. J. Thomson's plum-pudding model is; an atom consists of positively charged matter that contains negatively charged particles.

The model of J. J. Thomson looked at the atom merely as a ball of positive charges into which negative charges were embedded.

This model was propounded by J. J. Thomson in the year 1897. This model began the journey into empirical observation of the structure of the atom.

Thompson further carried out his experiments using a cathode ray tube and propounded the model shown in the image attached to this answer.

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C. An atom consists of positively charged matter that contains negatively charged particles.

Explanation: