There are 30 known isotopes of Tellurium (Te) with atomic masses that range from 108 to 137. Naturally found tellurium consists of eight isotopes (listed in the table to the right); three of them are observed to be radioactive. 128Te has the longest known half-life, 2.2×1024 years (approx. 22 sextillion years), among all radioactive isotopes. Tellurium is the first element which can undergo Alpha Decay, with isotopes 106Te to 110Te being able to undergo this mode of decay.
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