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Element Fact
Rhenium was the last naturally occurring element to be identified, in 1925. It was so rare that only 1 g of the metal was extracted out of 660 kg of molybdenite ore.

Darmstadtium, Ds

darmstadtium sample

Atomic number: 110
Atomic mass: [271] (no stable nuclide)
Natural abundance: -
Isotopes: -

History and Production

Named after Darmstadt, Germany, by the IUPAC in August 2003. The element was claimed to have discovered by Oganessian and others at Dubna in 1987. However, this was confirmed by the discovery of 269Ds by Armbruster in Gesellschaft fur Schwerionenforschung (GSI), Darmstadt, in November 1994. The element was formed by repeat bombardment of 62Ni with 208Pb for many days. Few days later, 271Ds was produced by using 64Ni as projectiles.

Physical Data

Only a few atoms have been produce and thus its physical properties cannot be determined.

Interatomic distance: -
Melting point: n/a
Boiling point: n/a
Thermal conductivity/Wm-1K-1: n/a
Density/kgm-3: n/a

Standard Thermodynamic Data (atomic gas)

Enthalpy of formation: -
Gibbs free energy of formation: -
Entropy: -
Heat capacity: -

Electronic data

Electronic configuration: Electronic configuration: [Rn] 5f14 6d9 7s1
Term symbol: 3D3
Electron affinity: -   Electronegativity (Pauline): -
Ionization energy (first, second, third): -, -, - kJ/mol

Chemical properties

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