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  1. Which of the following particles is the lightest?

    2. A.

     Nucleus
    B.

     Electron
    C.

     Proton
    D.

     Meson

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    Answer : Option B

    Explanation :

    An electron is a negatively charged subatomic particle.
    It can be either free or bound to the nucleus of an atom.
    The invariant mass of an electron is approximately 9.109×10−31 kilograms,

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