Atomic Number: | 105 | Atomic Symbol: | Db
|
Atomic Weight: | 268 | Electron Configuration: | [Rn] 5f14 6d3 7s2 |
Shells: | 2,8,18,32,32,11,2 | Filling Orbital: | 6d2 |
Melting Point: | K ( oC) | Boiling Point: | K ( oC) |
Description: | A man-made radioactive transition metal |
History
Credit for the discovery of dubinium in 1967 is shared between teams of
scientists at the Joint Institute for Nuclear Research at Dubna, Russia and
scientists at Lawrence Berkeley National Laboratory, California. The element was
named after the research facility in Russia where it was synthesized.
Source:
Dubnium is a synthetic radioactive metal, created by nuclear bombardment, and has only been produced in tiny amounts. Dubnium is made by bombarding californium-249 with nitrogen. It can also be produced by bombarding americium-243 with neon
Isotopes:
Dubnium has 8 isotopes whose half-lives are known, with mass numbers from 255 to 263. None are stable. The most stable isotope is 262Db, with a half-life of 34 seconds