Some examples of radioactive elements...

The 3 most common naturally occurring radioactive elements are:
  • Rubidium - 87
  • Uranium - 238
  • Thorium - 232
Some uncommon radioactive elements (in that radioactive isotopes of such elements are rare relitive to other radioactive elements) are:
  • Osmium - 184
  • Xenon - 124
  • Zinc - 70
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