Db - Dubnium

An artifical element. Dubnium was discovered by Ghiorso and coworkers. Named for Dubna, a Russian town north of Moscow that is home to the Joint Institutes of Nuclear Research.

Atomic number - 105 Density g/mL -
Atomic weight u 262 Melting point K -
Bonding radius A - Boiling point K -
Atomic radius A - Heat of vaporization kJ/mol -
Ionization Potential V - Heat of fusion kJ/mol -
Electronegativity - - Specific heat J/gK -
The oxide is unknown.
Crystal are unknown.

Electron config. : [Rn] 5f14 6d3 7s2

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
H He
Li Be B C N O F Ne
Na Mg Al Si P S Cl Ar
K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr
Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe
Cs Ba La* Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn
Fr Ra Ac** Rf Db Sg Bh Hs Mt 110 111 112 113
Lanthanides* Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu
Actinides ** Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr

Isotopes of Db: Click mass number for decay process, product for element page.
255
1.6 sec
a/SF,9.600
Lr-251/?
255.0 		256
2.6 sec
a/EC/SF,9.500
Lr-252/Rf-256/?
256.0 		257
1.3 sec
a/EC/SF,9.310
Lr-253/Rf-257/?
257.10789 		258
20 sec
a/EC/SF,5.500
Lr-254/Rf-258/?
258.10939 		259

a,2.450 MeV
Lr-255
259.10971 		260
1.52 sec
a/EC/SF,9.370
Lr-256/Rf-260/?
260.11143 		261
1.8 sec
a/SF,9.270
Lr-257/?
261.11207
262
34 sec
a/EC/SF,9.210
Lr-258/Rf-262/?
262.11437 		263
27 sec
a/SF,9.030
Lr-259/?
263.11528 		264

,9.690 MeV

264.11766 		265

,10.800 MeV

265.11884 		266

,10.820 MeV

266.12131 		MASS abund.
Halflife
Particle, Energy
Decay Product(s)
Isotopic Mass

Updated by clh on 2/27/98. This is not a publication of Phoenix College.