Which of the following conclusions can be drawn from jj thomson's cathode ray experiments? a.) atoms contain electronsb.) practically all the mass of an atom is contained in its nucleusc.) atoms contain protons, neutrons, and electronsd.) atoms have positively charged nuclues surrounded by electron cloud

A.) Atoms contain electrons

Explanation:

J.J. Thomson conducted an experiment in which he took a gas at low pressure in a discharge tube and applied high voltage current. When he did so, he noticed that there are some particles emitting from cathode going towards the anode. Then he concluded that they are negatively charged particles and coined them electrons.

Hence, out of the options:- A.) Atoms contain electrons is correct.

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