hahnium
[ hah-nee-uh m ]
/ ˈhɑ ni əm /
noun Chemistry, Physics.
a proposed name for dubnium. Symbol: Ha
Also called
unnilpentium,
element 105.
Words nearby hahnium
hagueton,
hagåtña,
hah,
hahn,
hahnemann,
hahnium,
haida,
haidar ali,
haidarabad,
haidinger fringes,
haiduk
Definition for hahnium (2 of 4)
unnilpentium
[ yoo-nil-pen-tee-uh m ]
/ ˌyu nɪlˈpɛn ti əm /
noun Chemistry, Physics.
a former name of dubnium. Symbol: Unp
Also called
element 105. Formerly
hahnium.
Definition for hahnium (3 of 4)
dubnium
[ 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.
Formerly
hahnium,
unnilpentium,
element 105.
Origin of dubnium
named after
Dubna, the town in Russia where it was first produced; see
-ium
Definition for hahnium (4 of 4)
Formerly
unnilpentium,
hahnium.
Origin of element 105
First recorded in 1975–80
British Dictionary definitions for hahnium (1 of 2)
hahnium
/ (ˈhɑːnɪəm) /
noun
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, 262 Ha: 40 seconds
Now called dubnium
Word Origin for hahnium
C20: named after Otto
Hahn
British Dictionary definitions for hahnium (2 of 2)
dubnium
/ (ˈdʌbnɪəm) /
noun
a synthetic transactinide element produced in minute quantities by bombarding plutonium with high-energy neon ions. Symbol: Du; atomic no 105
See hahnium
Word Origin for dubnium
C20: after
Dubna, where it was first reported
Scientific definitions for hahnium
dubnium
[ dōōb′nē-əm ]
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.