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dubnium
[ doob-nee-uhm, duhb- ]
noun
, Chemistry, Physics.
- a superheavy, synthetic, radioactive element with a very short half-life. : Db; : 105.
dubnium
/ do̅o̅b′nē-əm /
- 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
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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 )
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Word History and Origins
Origin of dubnium1
C20: after Dubna , where it was first reported
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