Dubnium (Db), element 105 – Learn Acer periodic table

Transition metal, atomic number 105.

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.

Symbol Db. Atomic mass 268.0 u. Group 5, period 7. Electron configuration [Rn] 5f14 6d3 7s2. Electrons per shell 2, 8, 18, 32, 32, 11, 2. State at room temperature: Solid. Melting point unknown, boiling point unknown. Discovered by Joint Institute for Nuclear Research.

Element data from Wikipedia, CC BY-SA 3.0.

Dubnium (Db), element 105 – Learn Acer periodic table

Dubnium

Facts