dubnium(redirected from Eka-tantalum)
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n. Symbol Db
An artificially produced radioactive element with atomic number 105. The isotope with mass number 262 has the longest confirmed half-life (35 seconds), although longer half-lifes have been reported for some of its heavier isotopes. See Periodic Table.
[After Dubna, Russia, location of the United Institute of Nuclear Research.]
(Elements & Compounds) a synthetic transactinide element produced in minute quantities by bombarding plutonium with high-energy neon ions. Symbol: Du; atomic no 105. See hahnium
[C20: after Dubna, where it was first reported]
Symbol Db A synthetic, radioactive element that is produced from californium, americium, or berkelium. Its most stable isotope has a half-life of 34 seconds. Atomic number 105. See Periodic Table.
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|Noun||1.||dubnium - a transuranic element|