Dubnium is a chemical element in the Periodic Table marked with the atomic number of 105 and with the chemical symbol Db. This chemical element belongs to period 7 elements and the Transition Metals category. Similar to the rest of the Transition Metal elements Dubnium possesses various metallic properties. In the Periodic Table Dubnium is preceded by Rutherfordium and is followed by Seaborgium.


Dubnium is a synthetic chemical element, meaning it is artificially created in a laboratory. As such, it can never exist freely in nature as a natural element. This particular chemical element is quite unstable. Its most stable isotope has an approximate half-life of nearly 28 hours and thus, it has been only partially studied and not all of its properties are fully known. Dubnium does not play any known biological roles for human beings or other living organisms on Earth. The current usages and applications of this chemical element are purely for scientific research. It is a radioactive Transition Metal and was discovered in the late 1960s.



Physical Characteristics of Dubnium

In terms of physical characteristics Dubnium cannot be fully characterized. As a highly unstable and relatively new chemical element this Transition Metal is known to possess some metallic properties like the rest of the elements in group 5. Dubnium is a solid metallic element with a noteworthy high density – at 29.3 g/cm3 it is among the densest of all chemical elements in the Periodic Table. Dubnium has nuclear properties and a predicted body-centered cubic crystal structure. Its melting and boiling points are currently undiscovered.


Chemical Properties of Dubnium


Atomic Number – 105

Group – 5

Period – 7

Block – d

Electronic Configuration – 5f14 6d3 7s2

Relative Atomic Mass – 262 (262 g/mol)

Molecular Weight – 262

Electronegativity – N/A

Density (G CM-3) – 29.3 g/cm3 at room temperature

Melting Point – N/A

Boiling Point – N/A

Atomic Radius – 139 pm

Isotopes – 0

Electronic Shell – 2, 8, 18, 32, 32, 11, 2


Discovery of Dubnium

The discovery of Dubnium is credited to the Joint Institute for Nuclear Research in Dubna, Russia. A team of Russian scientists were able to synthesize a new element in 1968 by bombarding Americium with Neon ions. In 1970 a team of American scientists from the University of California also synthesized Dubnium independently from the Russian team by bombarding Californium with Nitrogen ions.


The Russian team initially proposed the name Neilsbohrium and the American team proposed the name Hahnium with both names being derived from the actual names of two nuclear scientists. The International Union of Pure and Applied Chemistry settled on the name Dubnium in 1996, naming the new element after the town of Dubna where the Joint Institute of Nuclear Research was.


Recognized by: Joint Institute of Nuclear Research (1968)

Known and discovered by: Joint Institute of Nuclear Research (1968)

Named by: International Union of Pure and Applied Chemistry (1996)


Uses and role of Dubnium

Dubnium does not play any known biological role to human beings or other living organisms on Earth. Due to the fact that most physical and chemical properties of Dubnium are still being investigated and researched, at this point the element does not have any known uses apart from pure scientific research.


Dubnium on Earth

Dubnium is a synthetic chemical element – it is a product of artificial creation and it does not freely on Earth as a natural element or in any actual form.