While the moment in time at which a particular nucleus decays is unpredictable, a collection of atoms of a radioactive nuclide decays Samarium-147 ).
2.
In contrast, the radioactive nuclide beryllium-7 falls into this light element range, but this nuclide has a half-life too short for it to have been formed before the formation of the solar system, so that it cannot be a primordial nuclide.
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