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Dubnium, 105Db
Dubnium
Pronunciation
Mass number[268]
Dubnium in the periodic table
Hydrogen Helium
Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon
Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon
Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton
Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Silver Cadmium Indium Tin Antimony Tellurium Iodine Xenon
Caesium Barium Lanthanum Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercury (element) Thallium Lead Bismuth Polonium Astatine Radon
Francium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson
Ta
↑
Db
↓
—
rutherfordium ← dubnium → seaborgium
Atomic number (Z)105
Groupgroup 5
Periodperiod 7
Block  d-block
Electron configuration[Rn] 5f14 6d3 7s2[3]
Electrons per shell2, 8, 18, 32, 32, 11, 2
Physical properties
Phase at STPsolid (predicted)[4]
Density (near r.t.)21.6 g/cm3 (predicted)[5][6]
Atomic properties
Oxidation statescommon: (none)
(+3), (+4), (+5)[3]
Ionization energies
  • 1st: 665 kJ/mol
  • 2nd: 1547 kJ/mol
  • 3rd: 2378 kJ/mol
  • (more) (all but first estimated)[3]
Atomic radiusempirical: 139 pm (estimated)[3]
Covalent radius149 pm (estimated)[7]
Other properties
Natural occurrencesynthetic
Crystal structure ​body-centered cubic (bcc) (predicted)[4]
CAS Number53850-35-4
History
Namingafter Dubna, Moscow Oblast, Russia, site of Joint Institute for Nuclear Research
Discoveryindependently by the Lawrence Berkeley Laboratory and the Joint Institute for Nuclear Research (1970)
Isotopes of dubnium
Main isotopes[8] Decay
abun­dance half-life (t1/2) mode pro­duct
262Db synth 34 s[9][10] α67% 258Lr
SF33% –
263Db synth 27 s[10] SF56% –
α41% 259Lr
ε3% 263mRf
266Db synth 11 min[11] SF –
ε 266Rf
267Db synth 1.4 h[11] SF –
268Db synth 16 h[12] SF –
ε 268Rf
α[12] 264Lr
270Db synth 1 h[13] α87% 266Lr
SF13% –
File:Symbol category class.svg Category: Dubnium
| references
child table, as reused in {IB-Db}
Main isotopes of dubnium
Main isotopes[8] Decay
abun­dance half-life (t1/2) mode pro­duct
262Db synth 34 s[14][10] α67% 258Lr
SF33% –
263Db synth 27 s[10] SF56% –
α41% 259Lr
ε3% 263mRf
266Db synth 11 min[11] SF –
ε 266Rf
267Db synth 1.4 h[11] SF –
268Db synth 16 h[12] SF –
ε 268Rf
α[12] 264Lr
270Db synth 1 h[13] α87% 266Lr
SF13% –
Data sets read by {{Infobox element}}
Name and identifiers
Symbol etymology (11 non-trivial)
Top image (caption, alt) caption:

alt:
Pronunciation
Allotropes (overview)
Group (overview)
Period (overview)
Block (overview)
Natural occurrence
Phase at STP
Oxidation states
Spectral lines image
Electron configuration (cmt, ref)
Isotopes
Standard atomic weight
  most stable isotope
File:Notification-icon-Wikidata-logo.svg Wikidata
Wikidata *
* Not used in {{Infobox element}} (2023-01-01)
See also {{Index of data sets}} · Cat:data sets (0) · (this table:
)

References

These references will appear in the article, but this list appears only on this page.
  1. ↑ Lua error in Module:Citation/CS1/Configuration at line 2088: attempt to index field '?' (a nil value).
  2. ↑ Lua error in Module:Citation/CS1/Configuration at line 2088: attempt to index field '?' (a nil value).
  3. ↑ 3.0 3.1 3.2 3.3 Lua error in Module:Citation/CS1/Configuration at line 2088: attempt to index field '?' (a nil value).
  4. ↑ 4.0 4.1 Lua error in Module:Citation/CS1/Configuration at line 2088: attempt to index field '?' (a nil value).
  5. ↑ Lua error in Module:Citation/CS1/Configuration at line 2088: attempt to index field '?' (a nil value).
  6. ↑ Lua error in Module:Citation/CS1/Configuration at line 2088: attempt to index field '?' (a nil value).
  7. ↑ Lua error in Module:Citation/CS1/Configuration at line 2088: attempt to index field '?' (a nil value).
  8. ↑ 8.0 8.1 Lua error in Module:Citation/CS1/Configuration at line 2088: attempt to index field '?' (a nil value).
  9. ↑ Lua error in Module:Citation/CS1/Configuration at line 2088: attempt to index field '?' (a nil value).
  10. ↑ 10.0 10.1 10.2 10.3 Six New Isotopes of the Superheavy Elements Discovered. Berkeley Lab. News center. October 26, 2010
  11. ↑ 11.0 11.1 11.2 11.3 Lua error in Module:Citation/CS1/Configuration at line 2088: attempt to index field '?' (a nil value).
  12. ↑ 12.0 12.1 12.2 12.3 Lua error in Module:Citation/CS1/Configuration at line 2088: attempt to index field '?' (a nil value).
  13. ↑ 13.0 13.1 Lua error in Module:Citation/CS1/Configuration at line 2088: attempt to index field '?' (a nil value).
  14. ↑ Lua error in Module:Citation/CS1/Configuration at line 2088: attempt to index field '?' (a nil value).

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