dubnium

Also known as Db, element 105, hahnium, unnilpentium, Unp

Dubnium is a synthetic chemical element; it has symbol Db and atomic number 105. It is highly radioactive: the most stable known isotope, dubnium-268, has a half-life of about 16 hours. This greatly limits extended research on the element.

AI overview

Dubnium is a human-made chemical element (symbol Db, atomic number 105) that is extremely radioactive and decays very quickly, with its most stable form lasting only about 16 hours. Because it breaks down so rapidly, scientists have difficulty studying it in detail, which limits what we can learn about this element's properties and potential uses.

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Wikidata facts

Image: Dubnium.svg

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atomic number: 105
Commons gallery: Dubnium
element symbol: Unp
Commons category: Dubnium
time of discovery or invention: 1970-02-18
Unicode character: 𨧀
electron configuration: [Rn] 5f¹⁴ 6d³ 7s²

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Article

13 sections

Contents

Introduction
Discovery
Background
Reports
Naming controversy
Isotopes
Predicted properties
Atomic and physical
Chemical
Experimental chemistry
Notes
References
Bibliography

Dubnium does not occur naturally on Earth and is produced artificially. The Soviet Joint Institute for Nuclear Research (JINR) claimed the first discovery of the element in 1968, followed by the American Lawrence Berkeley Laboratory in 1970. Both teams proposed their names for the new element and used them without formal approval. The long-standing dispute was resolved in 1993 by an official investigation of the discovery claims by the Transfermium Working Group, formed by the International Union of Pure and Applied Chemistry and the International Union of Pure and Applied Physics, resulting in credit for the discovery being officially shared between both teams. The element was formally named dubnium in 1997 after the town of Dubna, the site of the JINR.