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    Identify Unknown Element Given Atomic Mass and Percent Abundance

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    An unknown element is found to have three naturally occurring isotopes with the following information.

    Atomic mass Percent abundance
    35.9675 0.337%
    37.9627 0.063%
    39.9824 99.600%

    Which of the follwoing is the unknown element?

    a. Cl
    b. Ca
    c. K
    d. Ar
    e. None of these could be the unknown element.

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