dubnium (redirected from Eka-tantalum)

dub·ni·um  (dbn-m)

n. Symbol Db

An artificially produced radioactive element with atomic number 105 whose 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. Also called unnilpentium. See Table at element.

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[After Dubna, Russia, the location of the United Institute of Nuclear Research.]

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dubnium [ˈdʌbnɪəm]

n

(Chemistry / Elements & Compounds) a synthetic transactinide element produced in minute quantities by bombarding plutonium with high-energy neon ions. Symbol: Du; atomic no. 105

[after Dubna in Russia, where it was first reported]

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dubnium  (dbn-m)

Symbol Db

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. See Periodic Table.

Thesaurus

Noun

1.

dubnium - a transuranic element atomic number 105, Db, element 105, hahnium chemical element, element - any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter