110Ds

Darmstadtium

Unknown propertiesunknownblock d

A synthetic element made at Darmstadt in 1994 by fusing lead with nickel, existing for a few seconds at most before it alpha-decays away.

Atomic number	110
Mass number (longest-lived isotope)	281 g/mol
This element has no stable isotope, so it has no standard atomic weight. The figure above is the mass number of its longest-lived isotope — a convention, not a measurement of a natural mixture.
Group · period	10 · 7
Electron configuration	[Rn] 5f¹⁴ 6d⁸ 7s²

About Darmstadtium

Darmstadtium was made by cold fusion in the accelerator sense — firing nickel-62 at a lead-208 target so the compound nucleus forms with as little excitation energy as possible, maximising the chance it survives instead of fissioning. The GSI team detected a single atom on 9 November 1994. Nobody has done any chemistry on it, and even the electron configuration is a calculation; whether it resembles platinum in any way is unknown, so the category is left open here. The name follows GSI's habit of honouring its own geography, alongside hassium for the state of Hesse. Its longest-lived isotope, darmstadtium-281, lasts about fourteen seconds.

Use 281 g/mol in these solvers

Moles from Mass (n = m/M)

n = \frac{m}{M}

Opens with M = 281 g/mol already filled in

Gas Density from Molar Mass

\rho = \frac{PM}{RT}

Opens with M = 281 g/mol already filled in

Faraday's Law of Electrolysis (m = QM/nF)

m = \frac{Q M}{n F}

Opens with M = 281 g/mol already filled in

Ion Concentration as CaCO₃ Equivalent

C_{\mathrm{CaCO_3}} = C_{\mathrm{ion}} \times \frac{50.04}{\mathrm{EW}}

Opens with EW = 281 g/mol already filled in

Acid Feed to Reduce Alkalinity

\dot m = \frac{\Delta \mathrm{Alk} \, Q \times \frac{\mathrm{EW}}{50.04}}{p/100\%}

Opens with EW = 281 g/mol already filled in

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