ANSWERS: 1
  • "No elements above Z = 83 have any stable isotopes." Source: http://kaffee.50webs.com/Science/activities/Chem/Activity.Isotopes.Table.htm "Every element beyond 83-bismuth is radioactive (has no stable isotope), and is therefore toxic." Source: http://www.vaughns-1-pagers.com/biology/human-periodic-elements.htm So Elements without stable isotopes would be: 84Po, 85At, 86Rn, 87Fr, 88Ra, 89Ac, etc Further information: http://en.wikipedia.org/wiki/Table_of_chemical_elements http://en.wikipedia.org/wiki/Isotope_table_%28complete%29

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