dub·ni·um (d b n - m)n. Symbol Db A radioactive synthetic element whose longest-lived isotopes have mass numbers of 258, 261, 262, and 263 with half-lives of 4.2, 1.8, 34, and 30 seconds. Atomic number 105. |
dubnium (Db)
Etymology: Joint Institute for Nuclear Research at Dubna, Russia
a transuranic element. Its atomic number is 105, and the mass of its best-known isotope is 260. It is produced by an induced nuclear reaction. Also called element 105. Formerly called hahnium.
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