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  1. The nucleus of a hydrogen atom consists of

    2. A.

     1 proton only
    B.

     1 proton + 2 neutron
    C.

     1 neutron only
    D.

     1 electron only

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    Answer : Option A

    Explanation :

    Most hydrogen atoms have nuclei that consist of a single proton, but a small fraction (about 0.015 percent) of the hydrogen atoms that occur in Nature have one neutron in addition to the proton in their nuclei.

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