Assertion: tellurium's isotope | /r/HasAspect | long half-life of 1.3(4)×1013
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Source sentences:
text: 123Te, 128Te, and 130Te are radioactive; the minor isotope 123Te has a long half-life of 1.3(4)×1013 a and transforms into 123Sb without significantly affecting either element's atomic weight even over geological time.