Plantilya:Infobox dubnium

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Dubnium
105Db
Ta

Db

(Ups)
rutherfordiumdubniumseaborgium
Appearance
unknown
General properties
Name, simbolo, kaiphan dubnium, Db, 105
Pronunciation Plantilya:IPAc-en
Plantilya:Respell
Element category puthaw nga transisyon
Group, period, block 57, d
Standard atomic weight [268]
Electron configuration [Rn] 5f14 6d3 7s2
(predicted)[1]

2, 8, 18, 32, 32, 11, 2
(predicted)
Electron shells of dubnium (2, 8, 18, 32, 32, 11, 2 (predicted))
History
Discovery Joint Institute for Nuclear Research (1968)
Physical properties
Phase magahi (predicted)
Density (near r.t.) 29 (predicted)[1] g·cm−3
Atomic properties
Oxidation states 5, 4, 3 (predicted)[1]
(only bolded oxidation states are known experimentally)
Ionization energies
(more)
1st: 664.8 (estimated)[1] kJ·mol−1
2nd: 1546.7 (estimated)[1] kJ·mol−1
3rd: 2378.4 (estimated)[1] kJ·mol−1
Atomic radius 139 (estimated)[1] pm
Covalent radius 149 (estimated)[2] pm
Miscellanea
CAS registry number 53850-35-4
Most stable isotopes
Main article: Isotopes of dubnium
iso NA half-life DM DE (MeV) DP
262Db syn 34 s[3][4] 67% α 8.66,8.45 258Lr
33% SF
263Db syn 27 s[4] 56% SF
41% α 8.36 259Lr
3% ε 263mRf
266Db syn 22 min[4] SF
ε 266Rf
267Db syn 1.2 h[4] SF
268Db syn 29 h[4] SF
ε 268Rf
270Db syn 23.15 h[5] SF
only isotopes with half-lives over 5 seconds are included here

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Plantilya:Template reference list

  1. 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Haire, Richard G. (2006). "Transactinides and the future elements". in Morss; Edelstein, Norman M.; Fuger, Jean. The Chemistry of the Actinide and Transactinide Elements (3rd ed.). Dordrecht, The Netherlands: Springer Science+Business Media. ISBN 1-4020-3555-1. 
  2. Chemical Data. Dubnium - Db, Royal Chemical Society
  3. Münzenberg, G.; Gupta, M. (2011). Production and Identification of Transactinide Elements. p. 877. doi:10.1007/978-1-4419-0720-2_19. 
  4. 4.0 4.1 4.2 4.3 4.4 Six New Isotopes of the Superheavy Elements Discovered. Berkeley Lab. News center. October 26, 2010
  5. Oganessian, Yu. Ts.; Abdullin, F. Sh.; Bailey, P. D.; Benker, D. E.; Bennett, M. E.; Dmitriev, S. N.; Ezold, J. G.; Hamilton, J. H.; et al. (2010). "Synthesis of a New Element with Atomic Number Z=117". Physical Review Letters 104. doi:10.1103/PhysRevLett.104.142502. PMID 20481935. Bibcode2010PhRvL.104n2502O.