Dubnyum

Dubnium
105Db
Ta ↑ Db ↓ (Ups) Periodic table rutherfordium ← dubnium → seaborgium
Panagway
unknown
Kinatibuk-ang mga kinaiya
Ngalan, simbolo, kaiphan	dubnium, Db, 105
Paglitok	/ˈduːbniəm/ [[Help:Pronunciation respelling key|Plantilya:Smallcaps all-nee-əm]]
Kategoriyang elemento	puthaw nga transisyon
Group, period, block	5, 7, d
Gibug-aton sa atomo	[268]
Kontorno sa elektron	[Rn] 5f14 6d3 7s2 (predicted)[1] 2, 8, 18, 32, 32, 11, 2 (predicted)
History
Pagkadiskobre	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 Dubnium (0:02) Common English pronunciation of dubnium
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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.

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 (eds.). The Chemistry of the Actinide and Transactinide Elements (3rd ed.). Dordrecht, The Netherlands: Springer Science+Business Media. ISBN 1-4020-3555-1.{{cite book}}: CS1 maint: ref duplicates default (link)
2. ↑ Chemical Data. Dubnium - Db, Royal Chemical Society
3. ↑ Münzenberg, G.; Gupta, M. (2011). "Production and Identification of Transactinide Elements": 877. doi:10.1007/978-1-4419-0720-2_19. {{cite journal}}: Cite journal requires |journal= (help)
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.; Henderson, R. A. (2010). "Synthesis of a New Element with Atomic Number Z=117". Physical Review Letters. 104. Bibcode:2010PhRvL.104n2502O. doi:10.1103/PhysRevLett.104.142502. PMID 20481935.