Dubnyum

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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

Plantilya:Listen

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Ang dubnyum (Iningles dubnium) mao ang elementong kimiko sa talaang peryodiko nga may simbolo nga Db ug kaiphan nga atomik 105. Ang dubnyum mao ang puthaw nga transisyon.

Ang mga gi basihan niini[usba | edit source]

  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. 


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