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  3. transition element
  4. actinium
  5. actinide
  6. plutonium
Scope note
A highly toxic metallic transuranic element. It occurs in trace amounts in uranium ores and is produced in a nuclear reactor by neutron bombardment of uranium-238. The most stable and important isotope, plutonium-239, readily undergoes fission and is used as a reactor fuel in nuclear power stations and in nuclear weapons.
Accepted term: 14-May-2014