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[hah-nee-uh m] /ˈhɑ ni əm/

noun, Chemistry, Physics.
a proposed name for . Symbol: Ha.
[yoo-nil-pen-tee-uh m] /ˌyu nɪlˈpɛn ti əm/
noun, Chemistry, Physics.
a former name of . Symbol: Unp.
[doob-nee-uh m, duhb-] /ˈdub ni əm, ˈdʌb-/
noun, Chemistry, Physics.
a superheavy, synthetic, radioactive element with a very short half-life. Symbol: Db; atomic number: 105.
noun, Chemistry, Physics.
a name once advanced by the American Chemical Society for a transuranic element, artificially produced from californium, atomic no: 105; half-life of most stable isotope, 262Ha: 40 seconds Now called dubnium
a synthetic transactinide element produced in minute quantities by bombarding plutonium with high-energy neon ions. Symbol: Du; atomic no 105 See hahnium

hahnium hah·ni·um (hä’nē-əm)
Element 105.
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.


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