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9 March, 10:19

What radioactive element has the lowest atomic number

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Answers (2)
  1. 9 March, 10:36
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    Technetium, with atomic number (denoted Z) 43, is the lowest-numbered element in the periodic table of which all isotopes are radioactive. The second-lightest exclusively radioactive element, promethium, has an atomic number of 61.
  2. 9 March, 10:44
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    Technetium, with atomic number (denoted Z) 43, is the lowest-numbered element in the periodic table of which all isotopes are radioactive. The second-lightest exclusively radioactive element, promethium, has an atomic number of 61.
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