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Saturday, March 02, 2013


  • Dubnium is a chemical element with the symbol Db , Electronic configuration [Rn] 5f14 6d3 7s2, Atomic number 105, Atomic mass 261.9 g.mol -1.
  • Dubnium is harmful due to its radioactivity.
  • Dubnium is a highly radioactive metal.
  • Dubnium is a radioactive synthetic metal and has only been produced in tiny amounts.
  • Dubnium is of research interest only.
  • The atomic weight of nine known isotopes range from 255 to 263, the longest-lived isotope, Dubnium 268 has a half-life of 32 hours.
  • Dubnium is not found free in the environment, it is a synthetic element.

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