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 .
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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 .