Template:Infobox dubnium

Dubnium,  ₁₀₅Db

General properties
Name, symbol	dubnium, Db
Pronunciation	i/ˈduːbniəm/ DOOB-nee-əm
Dubnium in the periodic table
Ta ↑ Db ↓ (Ups) rutherfordium ← dubnium → seaborgium
Atomic number (Z)	105
Group, block	group 5, d-block
Period	period 7
Element category	transition metal
Standard atomic weight (Ar)	[268]
Electron configuration	[Rn] 5f14 6d3 7s2 (predicted)
per shell	2, 8, 18, 32, 32, 11, 2 (predicted)
Physical properties
Phase	solid (predicted)
Density near r.t.	29.3 g/cm3 (predicted)
Atomic properties
Oxidation states	5, (4), (3) ​(parenthesized oxidation states are predictions)
Ionization energies	1st: 664.8 kJ/mol 2nd: 1546.7 kJ/mol 3rd: 2378.4 kJ/mol (more) (all estimated)
Atomic radius	empirical: 139 pm (estimated)
Covalent radius	149 pm (estimated)
Miscellanea
Crystal structure	​body-centered cubic (bcc) (predicted)
CAS Number	53850-35-4
History
Naming	after the town of Dubna in Russia
Discovery	Joint Institute for Nuclear Research (1968)
Most stable isotopes of dubnium
iso NA half-life DM DE (MeV) DP 262Db syn 34 s 67% α 8.66, 8.45 258Lr 33% SF 263Db syn 27 s 56% SF 41% α 8.36 259Lr 3% ε 263mRf 266Db syn 22 min SF ε 266Rf 267Db syn 1.2 h SF 268Db syn 29 h SF ε 268Rf 270Db syn 23.15 h 17% SF 83% α 266Lr

References

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