Which of these nuclides is most likely to be radioactive?

Name: Which of these nuclides is most likely to be radioactive?
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Nuclides with atomic numbers above 83 (bismuth) are typically unstable and radioactive, with the exception of isotopes of technetium and promethium which have atomic numbers lower than 83 but are still radioactive. Americium, with an atomic number of 95, is far above this threshold and therefore the most likely to be radioactive.

Which of These Nuclides Is Most Likely to Be Radioactive