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    Question

    Which of the following particles has the least

    mass?
    A Proton Correct Answer Incorrect Answer
    B Neutron Correct Answer Incorrect Answer
    C Electron Correct Answer Incorrect Answer
    D Alpha particle Correct Answer Incorrect Answer

    Solution

    The mass of an electron (9.1times10−31 kg9.1 \\times 10^{-31} \, \text{kg}9.1times10−31kg) is much smaller than that of protons, neutrons, and alpha particles.

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