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

/ 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

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