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Neutrons have mass comparable to that of protons, but neutrons are devoid of any electric charge. We will talk more about neutrons and their whereabouts when we study radioactivity.

Now a natural question is whether electrons, protons, and neutrons are the most fundamental particles. The answer is no. These fundamental particles are made of more fundamental particles called quarks. But, we don't have to go that far for the MCAT. Just be aware that such sub-fundamental particles exist, fundamental particles being electrons, protons, and neutrons.

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