105Db268.126
Dubnium
Transition Metal
Solid at STP
Period 7Group 5Block DDiscovered 1967
[Rn]7s2 5f14 6d3
Dubnium 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.
📖 Read more on Wikipedia →Atomic Properties
| Atomic Number | 105 |
| Atomic Mass | 268.126 u |
| Electron Configuration | [Rn]7s2 5f14 6d3 |
| Oxidation States | 5, 4, 3 |
| Block | D |
Physical Properties
| Standard State | Solid |
| CPK Color | #D1004F |
Classification
| Category | Transition Metal |
| Group Block | Transition metal |
| Period | 7 |
| Group | 5 |
| Block | D |
Discovery
| Year Discovered | 1967 |
| Discovered By | Joint Institute for Nuclear Research |
| Electron Shells | 2, 8, 18, 32, 32, 11, 2 |