110 Ds Darmstadtium 281*
Transition metal d-block Period 7 Group 10 Radioactive Synthetic

Darmstadtium

Ds · Element 110 · Transition metal

Created at Darmstadt in 1994 by fusing nickel and lead nuclei.

State at 20°C Solid
Atomic mass 281 u
Electron configuration[Rn] 5f¹⁴ 6d⁸ 7s²

Structure

The darmstadtium atom

Not a diagram of dots on rings — a Monte-Carlo sample of the actual probability density |ψ|² for each occupied subshell. Drag to rotate. Blue and violet mark opposite signs of the wavefunction, which is what makes bonding possible.

Orbital cloud

Measured values

Property sheet

Every bar shows where darmstadtium sits among all 118 elements for that property.

Physical

Density 34.8 g/cm³~ 97%
Melting point —
Boiling point —
Specific heat —
Thermal conductivity —

Atomic

Atomic radius 247 pm~ 85%
Covalent radius 128 pm~
Van der Waals radius 247 pm~

Electronic

Electronegativity —
Ionisation energy 897.3 kJ/mol~ 79%
Electron affinity —

Occurrence

Abundance in crust 0 mg/kg 0%

Identity

SymbolDs
Atomic number110
Atomic mass281 u
CategoryTransition metal
Blockd
Crystal structureunknown
Oxidation states+4, +6
Discovered1994
Discovered byGSI Darmstadt

Sources: IUPAC 2021 standard atomic weights · CRC Handbook of Chemistry and Physics · NIST. Values marked ~ are predicted rather than measured.

Same element, different neutrons

Isotopes of darmstadtium

All darmstadtium atoms have the same number of protons, 110, and differ only in their number of neutrons: those variants are its isotopes. None of them is stable. The longest-lived known isotope, Ds-282, has 172 neutrons and a half-life of ~1.1 min.

Long-lived and well-known isotopes of darmstadtium
ISOTOPE Neutrons Natural Abundance Half-life Decay Mode
Ds-277 167 — 3.5 ms α, SF
Ds-279 169 — 0.216 sec SF, α
Ds-280 170 — ~7 ms SF
Ds-281 171 — 12 sec SF (94%), α (6%)
Ds-282 longest-lived 172 — ~1.1 min α, SF

Periodic tables list 281 for darmstadtium: the mass number of one long-lived isotope, not an average, so mass minus atomic number gives 171, the neutron count of Ds-281.

Decay modes

α
alpha decay
SF
spontaneous fission

~ marks a half-life whose published uncertainty is larger than the value itself.

Data: IAEA Nuclear Data Section, LiveChart of Nuclides, ground-state evaluations, retrieved October 10, 2026. Abundance is the share of atoms in the natural element; a dash means the isotope has no standard natural abundance.

Size, to scale

How big is a darmstadtium atom?

Radius 247 pm — that is 0.247 nm, so about 2.02 million of them side by side would span a millimetre.

Thermal range

Solid, liquid, gas — and when

Neither transition has been measured for darmstadtium — too few atoms have ever existed at once.

Where it sits

Position in the table

Darmstadtium sits in period 7, group 10. Everything in group 10 shares the same outer-electron count, which is why they behave so similarly.

Other transition metals

All transition metals

The story

What darmstadtium is, and how we found it

Created at Darmstadt in 1994 by fusing nickel and lead nuclei.

The discovery of darmstadtium

Darmstadtium was first synthesized in 1994 by an international research team led by Sigurd Hofmann at the GSI Helmholtz Centre for Heavy Ion Research in Darmstadt, Germany, using their advanced heavy-ion linear accelerator (UNILAC) and sophisticated detection systems. The discovery involved bombarding lead-208 targets with nickel-62 ions accelerated to extremely high energies, successfully creating darmstadtium-269 through nuclear fusion and detecting its characteristic alpha decay chain over several seconds. The German team used the advanced detection equipment available at the time, including position-sensitive detectors and sophisticated data analysis systems, to identify darmstadtium atoms through their unique radioactive decay signatures and energy measurements. The element was initially assigned the systematic name "ununnilium" (meaning "one-one-zero" in Latin) according to International Union of Pure and Applied Chemistry (IUPAC) conventions for temporarily naming newly discovered superheavy elements. The research team proposed the name "darmstadtium" in honor of the city of Darmstadt, where the GSI research facility is located, following the scientific tradition of naming elements after places significant to their discovery. The discovery represented a remarkable achievement in nuclear physics, requiring high precision in accelerator operation, target preparation, and detection methodology to create and identify atoms that exist for only seconds. The successful synthesis involved years of technological development in heavy-ion accelerator physics, ultra-sensitive particle detection, and sophisticated data analysis techniques for identifying rare nuclear events. IUPAC officially approved the name "darmstadtium" with the symbol "Ds" in 2003 after thorough international review of the experimental evidence and confirmation of the discovery's validity. The achievement demonstrated the continuing advancement of superheavy element research and provided crucial experimental data for testing theoretical predictions about nuclear stability at the limits of atomic mass. This discovery opened new possibilities for synthesizing even heavier elements and contributed significantly to understanding the fundamental limits of nuclear structure and stability. The international collaboration required for this achievement exemplified the global nature of modern nuclear physics research and the importance of shared scientific knowledge and resources. The success of the darmstadtium synthesis established GSI as a world leader in superheavy element research and paved the way for future discoveries in this challenging field of nuclear science.

Applications

What darmstadtium is used for

Darmstadtium, as an extremely short-lived synthetic superheavy element with a half-life measured in seconds, has no practical applications beyond fundamental nuclear physics research and theoretical investigations into the limits of atomic structure. The element serves exclusively to advance scientific understanding of superheavy nuclei and provide experimental data for testing theoretical predictions about nuclear stability and the proposed island of stability. Research with darmstadtium contributes to validating nuclear shell models and exploring how protons and neutrons organize themselves in very heavy atomic nuclei near the limits of nuclear stability. The element is used as a testing ground for sophisticated theoretical models that attempt to predict the chemical and physical properties of superheavy elements through advanced quantum mechanical calculations. Darmstadtium research helps scientists understand how relativistic effects influence atomic behavior and chemical properties as elements become increasingly heavy and electrons move at significant fractions of the speed of light. The experimental techniques developed for creating and detecting darmstadtium have advanced nuclear physics instrumentation and contributed to improvements in particle accelerator technology and detection systems. Studies of darmstadtium provide important data for understanding stellar nucleosynthesis processes and how the heaviest elements in the universe are formed in high-energy astrophysical environments like neutron star mergers. The element's research contributes to training nuclear physicists and developing new experimental methodologies for studying rare nuclear phenomena at the frontiers of current scientific capability. While darmstadtium itself has no practical applications, the fundamental research it enables advances our understanding of nuclear processes that underlie important technologies in nuclear medicine, nuclear power, and materials science. The international collaborative efforts required for darmstadtium research promote scientific cooperation and knowledge sharing among the global nuclear physics research community. Future discoveries of longer-lived darmstadtium isotopes might reveal unique properties with potential applications in advanced scientific or technological fields. The element represents humanity's ongoing quest to understand the fundamental building blocks of matter and push the boundaries of what is scientifically possible.

Darmstadtium has no applications whatsoever in everyday life, industry, or practical technology due to the extremely short half-lives of its isotopes (about 12 seconds for darmstadtium-281) and the fact that only a few atoms can be produced at specialized research facilities worldwide. The element is used exclusively in advanced nuclear physics research at major international laboratories equipped with heavy-ion accelerators and the most sophisticated detection equipment available. Research institutions study darmstadtium to explore fundamental questions about the theoretical limits of atomic structure and the maximum number of protons that can be contained in a stable atomic nucleus. Nuclear physicists use darmstadtium as a benchmark for testing and validating theoretical models that predict the behavior and properties of superheavy elements at the limits of the periodic table. The element serves as an experimental testing ground for computational chemistry methods that attempt to predict chemical properties through relativistic quantum mechanical calculations rather than direct experimental measurement. Educational programs in nuclear physics use darmstadtium as a prime example of advanced research into the fundamental nature of matter and the ongoing scientific quest to understand atomic structure at its limits. Scientific databases and reference materials maintain comprehensive records of darmstadtium's properties to ensure complete documentation of all known chemical elements, even those existing only briefly under laboratory conditions. International scientific collaborations study darmstadtium to advance global understanding of superheavy element physics and foster knowledge sharing in nuclear research at the frontiers of science. The element's study contributes significantly to developing new experimental techniques and instrumentation for detecting and analyzing extremely rare nuclear events and short-lived nuclear species. While darmstadtium cannot be used in any practical applications, research into its properties advances fundamental science that underlies nuclear technologies used in medical imaging, cancer treatment, nuclear power generation, and materials research. The sophisticated methodologies developed for darmstadtium research contribute to major improvements in particle physics instrumentation, nuclear analysis techniques, and accelerator technology. The element demonstrates a high point of artificial element synthesis capabilities and represents a major achievement in creating new forms of matter through advanced nuclear physics research.

Where it comes from

Natural occurrence

0 mg/kg of Earth's crust · more abundant than 0% of elements

Darmstadtium has never been found in nature and has only been made artificially through nuclear fusion reactions using the advanced particle accelerator facilities available on Earth. The element is synthesized by bombarding heavy target nuclei with lighter projectile nuclei accelerated to extremely high energies, typically using nickel-62 projectiles and lead-208 targets to create darmstadtium-269 through nuclear fusion processes. Production requires the most sophisticated heavy-ion accelerators capable of accelerating ions to precise energies while maintaining high accuracy in beam focusing, target positioning, and timing systems. Even with the advanced accelerator technology available, only one or two atoms of darmstadtium can be produced per day, and these atoms decay within seconds of their creation through radioactive processes. Darmstadtium-281, one of the longest-lived known isotopes, has a half-life of approximately 12 seconds, while most other isotopes decay more rapidly, some within milliseconds of formation. The element's production is limited to perhaps three or four specialized research facilities worldwide, including GSI in Germany, RIKEN in Japan, and similar institutions with appropriate superheavy element synthesis capabilities. Darmstadtium has no geological occurrence and no environmental presence; whether the r-process in neutron star mergers briefly makes it is an open question. All darmstadtium research must be conducted on individual atoms or very small numbers of atoms detected through their characteristic radioactive decay signatures, requiring the most sensitive detection equipment available to science. The total amount of darmstadtium ever created by humanity would be far too small to detect by any conventional measurement technique, representing perhaps a few dozen atoms produced over decades of intensive research efforts. Environmental concentrations of darmstadtium are effectively zero everywhere, as the element cannot persist in nature because of its rapid radioactive decay. The element exists only momentarily in the highly controlled environment of nuclear physics laboratories before decaying into lighter elements within seconds of its creation. Future production capabilities are unlikely to increase significantly even with advancing technology, ensuring that darmstadtium will remain among the rarest and most ephemeral substances that can be created through human scientific endeavor.

Handling

Safety

Darmstadtium is radioactive. It has no stable isotope — every nucleus decays. Handling requires appropriate shielding and licensing.

Darmstadtium is radioactive, but it is made only a few atoms at a time in heavy-ion accelerators. Its isotopes decay by alpha emission and spontaneous fission; darmstadtium-281, for example, has a half-life of about 12 seconds. No weighable amount of darmstadtium has ever existed, so the atoms themselves cannot deliver a meaningful radiation dose to anyone. Darmstadtium research carries the radiological hazards typical of heavy-ion accelerator laboratories, and they come from the experiment, not the element: the accelerator beam, radioactive targets and activated equipment, and the waste these produce, which is managed as radioactive waste under national radiation protection rules. Staff follow the standard occupational radiation rules: annual dose limits, personal dose monitoring and keeping doses as low as reasonably achievable (ALARA). Workers under 18 face much lower dose limits than adults: one tenth of the adult limits under US Nuclear Regulatory Commission rules (10 CFR 20.1207), and 1 mSv a year at US Department of Energy laboratories (10 CFR 835.207). A worker who declares a pregnancy is limited to 5 mSv to the fetus over the whole pregnancy (10 CFR 20.1208 and 835.206).

Quick answers

Darmstadtium: common questions

What is darmstadtium?

Darmstadtium (symbol Ds) is element 110 on the periodic table, a transition metal in period 7, group 10. Created at Darmstadt in 1994 by fusing nickel and lead nuclei. At room temperature it is a solid, and it is radioactive.

What is the electron configuration of darmstadtium?

Darmstadtium's ground-state electron configuration is [Rn] 5f¹⁴ 6d⁸ 7s², giving 7 occupied shells with the distribution 2, 8, 18, 32, 32, 16, 2.

What is the atomic mass of darmstadtium?

Darmstadtium has no stable isotope, so it has no standard atomic weight. The figure quoted, 281, is the mass number of Ds-281, the isotope periodic tables usually list; the longest-lived one in the IAEA data is Ds-282.

How many neutrons does darmstadtium have?

Darmstadtium has no stable isotope. Its longest-lived known isotope, Ds-282, has 172 neutrons (mass number 282 minus atomic number 110) and a half-life of ~1.1 min. Periodic tables list 281 for darmstadtium, the mass number of one long-lived isotope, so mass minus atomic number gives 171, the neutron count of Ds-281.

How dense is darmstadtium?

Darmstadtium is predicted to have a density of about 34.8 g/cm³, though no sample large enough to weigh has ever been made. Water is 1.0 g/cm³ for comparison.

Who discovered darmstadtium, and when?

Darmstadtium was discovered in 1994 by GSI Darmstadt. Origin of the name: Darmstadt, Germany.

How common is darmstadtium on Earth?

Darmstadtium does not occur naturally on Earth in any meaningful quantity — it is made in a reactor or an accelerator.

Is darmstadtium radioactive?

Yes. Darmstadtium has no stable isotope — every one of its nuclei decays. It does not occur in usable quantities in nature and must be synthesised.