105
Db
268
Dubnium
Transition Metal
Group 5
Period 7
Block d
Dubnium is a chemical element of the periodic table with chemical symbol Db and atomic number 105 with an atomic weight of 268 u and is classed as transition metal and is part of group 5 (vanadium group). Dubnium is solid at room temperature.
Dubnium in the periodic table
| Symbol | Db |
| Atomic number | 105 |
| Group | 5 (Vanadium group) |
| Period | 7 |
| Block | d |
| Classification | Transition Metal |
| Appearance | - |
| Color | - |
| Number of protons | 105 p+ |
| Number of neutrons | 163 n0 |
| Number of electrons | 105 e- |
From Wikipedia, the free encyclopediaDubnium is a chemical element with symbol Db and atomic number 105. It is named after the town of Dubna in Russia (north of Moscow), where it was first produced. It is a synthetic element (an element that can be created in a laboratory but is not found in nature) and radioactive; the most stable known isotope, dubnium-268, has a half-life of approximately 28 hours.
Physical properties
| Phase at STP | Solid |
| Density | 29.3 g/cm3 |
| Atomic weight | 268 u |
Thermal properties
Atomic properties
| Electronegativity (Pauling Scale) | - |
| Electron affinity | - |
| Oxidation states | (+3), (+4), +5 (parenthesized: prediction) |
| Ionization energies |
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Electron configuration for dubnium
Electron configuration Shorthand configuration | [Rn] 5f14 6d3 7s2 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Full configuration | 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f14 6s2 6p6 6d3 7s2 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Electron configuration chart |
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| Electrons per shell | 2, 8, 18, 32, 32, 11, 2 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Outer shell electrons | 2 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Valence electrons (incl. d) | 5 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Valency electrons | 5 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bohr model | Figure: Shell diagram of Dubnium (Db) atom. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Orbital Diagram
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The history of Dubnium
| Discovery | Independently by the Lawrence Berkeley Laboratory and Joint Institute for Nuclear Research (1970) |
Discovery of dubnium Dubnium was synthesized independently in 1968 at JINR in Dubna and in 1970 at Berkeley, leading to a long dispute over discovery credit. IUPAC resolved the matter in 1997, naming the element after the Russian town of Dubna where the Joint Institute for Nuclear Research had performed key transactinide experiments. Its isotopes are highly unstable, with the longest-lived known isotopes lasting less than about a day. | |
| Original word | Dubna |
| Language of origin | Russian |
| Name source | Place |
| Meaning | “Dubna” |
| Country | Russia |
Naming The element is named after Dubna, the Russian town where the Joint Institute for Nuclear Research carried out key transactinide experiments. | |
Identifiers
List of unique identifiers for Dubnium in various chemical registry databases| CAS Number | 53850-35-4 |
| ChemSpider ID | - |
| EC number | - |
| PubChem CID Number | 56951718 |