DUBNIUM
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DUBNIUM |
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Introduction |
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| Atomic Number: | 105 | Group: | 5 or V B | 105 | 262 |
| Average Atomic Mass: | 262 | Period: | 7 |
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CAS Number: |
53850-35-4 | ||||
| Dubnium | |||||
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Classification |
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| Metal | Nonmetal | Metalloid | ||
| Alkali Metal | Alkali Earth Metal | Transition Metal | Chalcogen | Halogen |
| Noble Gas | Lanthanoid | Actinoid |
Rare Earth Metal |
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| Transuranium | No Stable Isotopes | |||
| Solid | Liquid | Gas |
Assumed Solid |
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Description |
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| In 1967 G. N. Flerov reported that a Soviet team working at the Joint Institute for Nuclear Research at Dubna may have produced a few atoms of 260105 and 261105 by bombarding 243Am with 22Ne. Their evidence was based on time-coincidence measurements of alpha energies. More recently, it was reported that early in 1970 Dubna scientists synthesized Element 105 and that by the end of April 1970 “had investigated all the types of decay of the new element and had determined its chemical properties.” The Soviet group proposed the name joliotium for Element 105. In late April 1970, it was announced that Ghiorso, Nurmia, Harris, K. A. Y. Eskola, and P. L. Eskola, working at the University of California at Berkeley, had positively identified Element 105. The discovery was made by bombarding a target of 249Cf with a beam of 84 MeV nitrogen nuclei in the Heavy Ion Linear Accelerator (HILAC). When a 15N nuclear is absorbed by a 249Cf nucleus, four neutrons are emitted and a new atom of 260105 with a halflife of 1.6 s is formed. While the first atoms of Element 105 are said to have been detected conclusively on March 5, 1970, there is evidence that Element 105 had been formed in Berkeley experiments a year earlier by the method described. Ghiorso and his associates have attempted to confirm Soviet findings by more sophisticated methods without success. In October 1971, it was announced that two new isotopes of Element 105 were synthesized with the heavy ion linear accelerator by A. Ghiorso and co-workers at Berkeley. Element 261105 was produced both by bombarding 250Cf with 15N and by bombarding 249Bk with 16O. The isotope emits 8.93-MeV alpha particles and decays to 257Lr with a half-life of about 1.8 s. Element 262105 was produced by bombarding 249Bk with 18O. It emits 8.45 MeV alpha particles and decays to 258Lr with a half-life of about 40 s. Eight isotopes of Element 105 are now recognized. In 1997, the International Union of Pure and Applied Chemistry adopted the name dubnium for Element 105. 1 |
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Physical Properties |
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| Density: | g/cm3 | Crystal Structure: | |
| Atomic Radius: | Covalent Radius: | ||
| Ionic Radius: | Atomic Volume: | cm3/mol |
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Electron Configuration and Bonding |
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| Predicted Electron Configuration: | [Rn] 7s2 5f14 6d3 |
Lewis Dot Diagram |
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| Actual Electron Configuration: | [Rn] 7s2 5f14 6d3 |
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| Block: | d | Db |
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| Highest Occupied Energy Level: | 7 | |||||||
| Valence Electrons: | 2 | |||||||
| Quantum Numbers: | n = 6 | ℓ = 2 | mℓ = 0 | ms = +½ | ||||
| Please note that information in this section can be derived entirely from the periodic table. Although most people do not discuss valence electrons of the d-block and f-block elements, on this page the number of electrons in the highest energy level of the actual electron configuration was used to determine valence electrons. | ||||||||
| Electron Affinity: | Oxidation States: | ||||||
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Thermochemistry |
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Video |
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| Video on dubnium from the University of Nottingham's periodicvideos.com |
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Isotopes |
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| Nuclide | Mass | Half-Life | Nuclear Spin | Binding Energy (kJ/mol) |
| 255Db | 255.10740(45)# | 1.7(5) s [1.6(+6-4) s] | 178395257704.444 | |
| 256Db | 256.10813(31)# | 1.9(4) s [1.6(+5-3) s] | 179174668649.71 | |
| 257Db | 257.10772(24)# | 1.53(17) s [1.50(+19-15) s] | (9/2+) | 179954079594.977 |
| 258Db | 258.10923(37)# | 4.5(6) s | 180733490540.243 | |
| 259Db | 259.10961(23)# | 0.51(16) s | 181512901485.514 | |
| 260Db | 260.11130(25)# | 1.52(13) s | 181393500058.759 | |
| 261Db | 261.11206(25)# | 1.8(4) s | 182172911004.025 | |
| 262Db | 262.11408(20)# | 35(5) s | 182952321949.292 | |
| 263Db | 263.11499(18)# | 29(9) s [27(+10-7) s] | 183731732894.558 | |
| 264Db | 264.11740(25)# | 3# min | 184511143839.824 | |
| 265Db | 265.1186(3)# | 15# min | 185290554785.091 | |
| 266Db | 266.12103(39)# | 20# min | 185171153358.34 | |
| 267Db | 267.12238(50)# | 73(+350-33) min | 185950564303.606 | |
| 268Db | 268.12545(57)# | 32(+11-7) h | 186729975248.873 | |
| 269Db | 269.12746(83)# | 3# h | 187509386194.144 | |
| 270Db | 270.13071(77)# | 1# h | 187389984767.388 | |
| Values marked # are not purely derived from experimental data, but at least partly from systematic trends. Spins with weak assignment arguments are enclosed in parentheses. 3 | ||||
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Reactions |
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Abundance |
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Compounds |
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Safety |
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| Note: Not every link below has an entry for every element on the periodic table. Sites were selected based on those that had a large number of element and compound entries. |
| Scorecard's Pollution Information − not an MSDS, but it does provide basic information (among other things) on human heath hazards and industrial uses. |
| Although not truly an MSDS, Oxford University's Physical and Theoretical Chemistry Laboratory does provide some basic information. |
| Iowa State University |
| ESPI Metals |
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Languages |
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| Afrikaans: | Dubnium | Albanian: | Dubnium | Armenian: | Դուբնիում | Arabic: | دبنيوم |
| Aromanian: | Dubniumu | Basque: | Bosnian: | Dubnij | Breton: | ||
| Bulgarian: | Дубний | Byelorussian: | Нільсборый | Catalan: | Dubni | Chinese: | 𨧀 |
| Cornish: | Dubnyum | Croatian: | Dubnij | Czech: | Dubnium | Danish: | Dubnium |
| Dutch: | Dubnium | Esperanto: | Dubnio | Estonian: | Dubnium | Faroese: | |
| Finnish: | Dubnium | French: | Dubnium | Friulian: | Frisian: | Dubnium | |
| Galician: | Dubnio | Georgian: | ნილსბორიუმი | German: | Dubnium | Greek: | |
| Hebrew: | דובניום | Hungarian: | Icelandic: | Irish Gaelic: | |||
| Italian: | Dubnio | Japanese: | ドブニウム | Kashubian: | Dubn | Kazakh: | Нильсборий |
| Korean: | 더브늄 | Latvian: | Nilsborijs | Lithuanian: | Dubnis | Luxembourgish: | Dubnium |
| Macedonian: | Дубниум | Malay: | Hahnium | Maltese: | Manx Gaelic: | Hahnium | |
| Mokshan: | Нилсбори | Mongolian: | Norwegian: | Dubnium | Occitan: | Dubni | |
| Ossetian: | Нильсборий | Polish: | Dubn | Portuguese: | Russian: | Нильсборий | |
| Scottish Gaelic: | Duibniam | Serbian: | Дубниjум | Slovak: | Dubnium | Spanish: | Dubnio |
| Sudovian: | Dubnis | Swahili: | Swedish: | Dubnium | Tajik: | Nil'sbori' | |
| Thai: | ดุบเนียม | Turkish: | Ukranian: | Дубній | Uzbek: | Жолиотий | |
| Vietnamese: | Ninsbori | Welsh: |
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For More Information |
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Sources |
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| (1) - Lide, David R. CRC Handbook of Chemistry and Physics, 83rd ed.; CRC Press: Boca Raton, FL, 2002; p 4-10. |
| (2) - Lide, David R. CRC Handbook of Chemistry and Physics, 83rd ed.; CRC Press: Boca Raton, FL, 2002; p 10-178 - 10-180. |
| (3) - Atomic Mass Data Center. http://amdc.in2p3.fr/web/nubase_en.html (accessed July 14, 2009). |
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DUBNIUM |
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| Site designed and maintained by Mr. Everett. |
| Last update: Thursday, August 12, 2010 |