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The Element Dubnium

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105

Db

Dubnium

268

Atomic Number: 105

Atomic Weight: 268

Melting Point: Unknown

Boiling Point: Unknown

Density: Unknown

Phase at Room Temperature: Solid

Element Classification: Metal

Period Number: 7    Group Number: 5    Group Name: none

Radioactive and Artificially Produced

What's in a name? Named for the Joint Institute for Nuclear Research at Dubna, Russia.

Say what? Dubnium is pronounced as DUB-nee-em.

History and Uses:

Scientists working at the Joint Institute for Nuclear Research in Dubna, Russia, first reported the production of dubnium in 1967. They bombarded atoms of americium-243 with ions of neon-22, forming atoms of dubnium-260 and five free neutrons and atoms of dubnium-261 and four free neutrons. In 1970, a group of scientists working at the Lawrence Radiation Laboratory, now known as the Lawrence Berkeley Laboratory, in Berkeley, California, bombarded atoms of californium-249 with ions of nitrogen-15, forming atoms of dubnium-260 and 4 free neutrons. Credit for the discovery of dubnium is still under debate.

Dubnium's most stable isotope, dubnium-268, has a half-life of about 32 hours and decays through spontaneous fission.

Due to the small amounts produced and its short half-life, there are currently no uses for dubnium outside of basic scientific research.

Estimated Crustal Abundance: Not Applicable

Estimated Oceanic Abundance: Not Applicable

Number of Stable Isotopes: 0   (View all isotope data)

Ionization Energy: Unknown

Oxidation States: Unknown

Electron Shell Configuration:

1s2

2s2   2p6

3s2   3p6   3d10

4s2   4p6   4d10   4f14

5s2   5p6   5d10   5f14

6s2   6p6   6d3

7s2