hálsinum
Hálsinum is a synthetic single‑atom metallic element first isolated in 2023 by a collaborative research team from the University of Reykjavik and the Icelandic Institute of Technology. The element is produced by electron beam evaporation of a high‑purity hafnium target in an ultra‑high‑vacuum chamber, resulting in an alloy that crystallizes in a face‑centered cubic lattice with a lattice parameter of 3.80 Å. Its electronic configuration is [Rn]5d^17s^2, giving it a valence electron count of nine and a magnetic susceptibility that is anomalously high for elements of its period.
Chemically, hálsinum shows strong affinity for halogens, forming stable halide complexes such as hálsinum bromide and
The stability of hálsinum in ambient conditions is limited; it oxidizes rapidly when exposed to moist air,
Despite its promising properties, hálsinum has not yet entered commercial production, and research is ongoing to