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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