dubnium

[doob-nee-uhm, duhb-]

noun

Chemistry, Physics.

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

dubnium

/ 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

dubnium

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

Word History and Origins

Origin of dubnium¹

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. )

Word History and Origins

Origin of dubnium¹

C20: after _Dubna , where it was first reported

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.

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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.

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

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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.

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

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