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The longest-lived artificial radioisotope of tellurium is 121 Te with a half-life of about 19 days. Several nuclear isomers have longer half-lives, the longest being 121m Te with a half-life of 154 days. The very-long-lived radioisotopes 128 Te and 130 Te are the two most common isotopes of tellurium.
The half-life of tellurium-128 is over 160 trillion times greater than the age of the universe, ... Orders of magnitude (time) Lists of isotopes, by element;
The other two, 128 Te and 130 Te, are slightly radioactive, [17] [18] [19] with extremely long half-lives, including 2.2 × 10 24 years for 128 Te. This is the longest known half-life among all radionuclides [20] and is about 160 trillion (10 12) times the age of the known universe.
Half-lives have been determined in laboratories for many radionuclides, and can range from nearly instantaneous—hydrogen-5 decays in less time than it takes for a photon to go from one end of its nucleus to the other—to fourteen orders of magnitude longer than the age of the universe: tellurium-128 has a half-life of 2.2 × 10 24 years.
128 Te 31.7% 2.2 × 10 24 y: β − β − ... Main isotopes of tellurium; Main isotopes [1] Decay; abundance half-life (t 1/2) mode ... Half-life time: usually {} ...
The isobar forming 132 Te/ 132 I is: Tin-132 (half-life 40 s) decaying to antimony-132 (half-life 2.8 minutes) decaying to tellurium-132 (half-life 3.2 days) decaying to iodine-132 (half-life 2.3 hours) which decays to stable xenon-132. The creation of tellurium-126 is delayed by the long half-life (230 k years) of tin-126.
The longest-lived radionuclide known, 128 Te, has a half-life of 2.2 × 10 24 years: 1.6 × 10 14 times the age of the Universe. Only four of these 35 nuclides have half-lives shorter than, or equal to, the age of the universe. Most of the other 30 have half-lives much longer.
This is the longest half-life directly measured for any unstable isotope; [4] only the half-life of tellurium-128 is longer. [ citation needed ] Of the chemical elements, only 1 element ( tin ) has 10 such stable isotopes, 5 have 7 stable isotopes, 7 have 6 stable isotopes, 11 have 5 stable isotopes, 9 have 4 stable isotopes, 5 have 3 stable ...