Darmstadtium

About Darmstadtium

Darmstadtium sits below platinum in group 10, and the prediction from relativistic Dirac-Hartree-Fock calculations is that it should be even more inert than Pt — the 7s and 6d shells contract enough to reduce reactivity below the already noble platinum-metal baseline. The catch is that nobody has tested it. The 1994 synthesis at GSI used a ⁶²Ni beam on a ²⁰⁸Pb target and produced ²⁶⁹Ds atoms one at a time, identified via the alpha-decay chain back to known nuclides. The longest-lived known isotope, ²⁸¹Ds, lives about 12.7 seconds before alpha-decaying — too short for any of the gas-phase chromatography tricks that have characterized rutherfordium, dubnium, seaborgium, and bohrium. Total atoms ever produced sit somewhere in the low single digits across all the world's heavy-element labs. The chemistry-relevant question is whether the d⁸ s² configuration even matters when the inner shells are this relativistic; the theorists predict +6 should be accessible (more so than for Pt), but until someone actually pushes a Ds atom through a chromatography column, those numbers are model output.