Beyond which element in the periodic table (based on atomic number)are the successive elemental nuclei considered to be radioactive?

Name: Beyond which element in the periodic table (based on atomic number)are the successive elemental nuclei considered to be radioactive?
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Elements beyond Bismuth (atomic number 83) in the periodic table are considered to be radioactive, meaning all isotopes of elements with atomic numbers greater than 83 are radioactive.

Beyond Which Element in the Periodic Table (Based on Atomic