The answer to the specific question about technetium is “it’s complicated, and we may not know yet”, according to physics Stack Exchange.
For the general question “why are some elements/isotopes less or more stable”—generally an isotope is more stable if it has a balanced number of protons and neutrons .
The answer to the specific question about technetium is “it’s complicated, and we may not know yet”, according to physics Stack Exchange.
For the general question “why are some elements/isotopes less or more stable”—generally an isotope is more stable if it has a balanced number of protons and neutrons .