dubnium

American  

[doob-nee-uhm, duhb-] / ˈdub ni əm, ˈdʌb- /

noun

Chemistry, Physics.

1. a superheavy, synthetic, radioactive element with a very short half-life. Db; 105.

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dubnium British  

/ ˈdʌbnɪəm /

noun

1. a synthetic transactinide element produced in minute quantities by bombarding plutonium with high-energy neon ions. Symbol: Du; atomic no 105 See hahnium

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dubnium Scientific  

/ do̅o̅b′nē-əm /

1. A synthetic, radioactive element that is produced from californium, americium, or berkelium. Its most long-lived isotopes have mass numbers of 258, 261, 262, and 263 with half-lives of 4.2, 1.8. 34, and 30 seconds, respectively. Atomic number 105.

2. See Periodic Table

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Etymology

Origin of dubnium

First recorded in 1970–75; officially assigned to element 105 in 1997; named after Dubna, the town in Russia where it was first produced; -ium ( def. )

Example Sentences

Over the course of 30 years, his inventions contributed to the discovery of americium, curium, berkelium, californium, einsteinium, fermium, mendelevium, nobelium, lawrencium, rutherfordium, dubnium and seaborgium.

From New York Times

Naturally there are berkelium, dubnium and darmstadtium, as well as livermorium - named after the Lawrence Livermore National Laboratory that, among other things, ensures that the US nuclear stockpile does not decay too quickly.

From BBC

When this element fell apart, decaying to a stable dubnium end product, it was thought to produce element 113 along the way.

From Scientific American

The team's first two decays emitted alphas four times to produce a nucleus of dubnium with an atomic weight of 262 which then split apart by fission.

From Science Magazine

But dubnium-262 is known to have an alternative decay path involving more alpha decays.

From Science Magazine