Darmstadtium

Darmstadtium is a synthetic chemical element; it has symbol Ds and atomic number 110. It is extremely radioactive: the most stable known isotope, darmstadtium-281, has a half-life of approximately 14 seconds. Darmstadtium was first created in 1994 by the GSI Helmholtz Centre for Heavy Ion Research in the city of Darmstadt, Germany, after which it was named.

Darmstadtium, 110Ds
Darmstadtium
Pronunciation
  • /dɑːrmˈstætiəm/
    (darm-STAT-ee-əm)
  • /dɑːrmˈʃtætiəm/ ⓘ
    (darm-SHTAT-ee-əm)
Mass number[281]
Darmstadtium in the periodic table
Hydrogen Helium
Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon
Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon
Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton
Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Silver Cadmium Indium Tin Antimony Tellurium Iodine Xenon
Caesium Barium Lanthanum Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercury (element) Thallium Lead Bismuth Polonium Astatine Radon
Francium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson
 Pt
↑
Ds
↓
(Uhq)
meitnerium ← darmstadtium → roentgenium
Atomic number (Z)110
Groupgroup 10
Periodperiod 7
Block  d-block
Electron configuration[Rn] 5f14 6d8 7s2 (predicted)
Electrons per shell2, 8, 18, 32, 32, 16, 2 (predicted)
Physical properties
Phase at STPsolid (predicted)
Density (near r.t.)26–27 g/cm3 (predicted)
Atomic properties
Oxidation states(0), (+2), (+4), (+6), (+8) (predicted)
Ionization energies
  • 1st: 960 kJ/mol
  • 2nd: 1890 kJ/mol
  • 3rd: 3030 kJ/mol
  • (more) (all estimated)
Atomic radiusempirical: 132 pm (predicted)
Covalent radius128 pm (estimated)
Other properties
Natural occurrencesynthetic
Crystal structure ​body-centered cubic (bcc)

(predicted)
CAS Number54083-77-1
History
Namingafter Darmstadt, Germany, where it was discovered
DiscoveryGesellschaft für Schwerionenforschung (1994)
Isotopes of darmstadtium
Main isotopes Decay
abun­dance half-life (t1/2) mode pro­duct
279Ds synth 0.2 s α10% 275Hs
SF90% –
281Ds synth 14 s SF94% –
α6% 277Hs

In the periodic table, it is a d-block transactinide element. It is a member of the 7th period and is placed in the group 10 elements, although no chemical experiments have yet been carried out to confirm that it behaves as the heavier homologue to platinum in group 10 as the eighth member of the 6d series of transition metals. Darmstadtium is calculated to have similar properties to its lighter homologues, nickel, palladium, and platinum.

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