165Ho
165Ho is the only stable and naturally occurring isotope of the element Holmium. It has an atomic mass of approximately 164.930637 atomic mass units. The nucleus of 165Ho contains 67 protons and 98 neutrons. This specific composition accounts for its stability, as it does not undergo radioactive decay.
Holmium itself is a rare-earth element with the symbol Ho and atomic number 67. It is classified
The significance of 165Ho lies in its role as a benchmark or target material in nuclear physics