Tellurium-128 is a stable isotope of the element tellurium, which has an atomic number of 52. It is one of the most abundant isotopes of tellurium, making up about 31% of natural tellurium. Tellurium-128 has a mass number of 128 and is used in various applications, including electronics and metallurgy. This isotope is also of interest in nuclear physics and astrophysics due to its potential role in processes like double beta decay. Research on tellurium-128 helps scientists understand fundamental interactions in particle physics and the formation of elements in the universe.