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You have reached 0 of 0 points, (0) Isotopes that undergo spontaneous decay are radioactive elements. Isotopes that undergo spontaneous decay are radioactive elements. The half-life is the time taken for one half of a radioactive element to decay. The half-life is a constant, therefore even if the sample decays, the half-life will remain the same. The half-life is the time taken for one half of a radioactive element to decay. The half-life is a constant, therefore even if the sample decays, the half-life will remain the same.N Reference Table
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