Dubnium: the essentials

Dubnium is a synthetic element that is not present in the environment at all. It has no uses.

Dubnium: historical information

Dubnium was discovered by Workers at the Nuclear Institute at Dubna, and the University of California, Berkeley, USA. in 1967 at USSR, United States. Origin of name: the origin of the name dubnium is the Joint Nuclear Institute at Dubna", an institute heavily involved in the search for heavy elements.

Dubnium apparently was synthesized by Russian and American workers independently by bombardment technologies. Its actual isolation as the free element has not been accomplished. In 1967, Flerov reported element 105 after experiments at the Joint Research Institute in Russia involving reactions between 243Am ions with 22Ne ions. In 1970, Ghiorso and others announced their synthesis of dubnium at Berkeley (California) in the USA. This method involved the collsion of 249Cf ions with 15N ions.

Dubnium around us Read more »

Dubnium has no biological role.

Dubnium is a synthetic element that is not present in the geosphere.

Abundances for cobalt in a number of different environments. More abundance data »
Location ppb by weight ppb by atoms Links
Universe (no data) (no data) Chemical elements abundance by weight in the universe on a miniature periodic table spark table
Crustal rocks (no data) (no data) Chemical elements abundance by weight in the earth's crust on a miniature periodic table spark table
Human (no data) ppb by weight (no data) atoms relative to C = 1000000 Chemical elements abundance by weight in humans on a miniature periodic table spark table

Physical properties Read more »

Heat properties Read more »

Crystal structure Read more »

The solid state structure of dubnium is: .

Dubnium: orbital properties Read more »

Dubnium atoms have 105 electrons and the shell structure is 2.8.18.32.32.11.2. The ground state electronic configuration of neutral Dubnium is [Rn].5f14.6d3.7s2 (a guess based upon that of tantalum) and the term symbol of Dubnium is 4F3/2 (a guess based upon guessed electronic structure).

Isolation

Isolation: only very small amounts of of element 105, dubnium, have ever been made. The first samples were made through nuclear reactions involving fusion of an isotope of californium, 249Cf, with one of nitrogen, 14N. A second route to the same isotope via berkelium is also known

15N + 249Cf → 261105Db + 4 1n

16N + 249Bk → 261105Db + 4 1n

Isolation of an observable quantity of dubnium has never been achieved.

Dubnium isotopes Read more »

Table. Stables isotopes of cobalt.
Isotope Mass
/Da
Natural
abund.
(atom %)
Nuclear
spin (I)
Nuclear
magnetic
moment (μ/μN)
nil

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