halogenion

Halogenion is a fictional chemical element used in speculative science and worldbuilding to illustrate a halogen-like member of the periodic table. In most treatments it is described as a highly reactive, nonmetal with properties reminiscent of the real halogens, including high electronegativity, the tendency to form diatomic molecules, and the ability to form salts with alkali and alkaline earth metals.

Physical and spectral properties: Halogenion is typically depicted as a volatile material, existing as a gas at ambient conditions or as a pale liquid, depending on model. It is said to have distinctive spectral lines that aid identification by spectroscopy.

Chemical behavior: It readily forms binary compounds with hydrogen to give hydrohalic-type acids, and with metals to form halides. It is prone to oxidation and to forming interhalogen-like species in reactive mixtures. Solvents and reaction media are described variably across works.

Occurrence and production: In fiction, halogenion may occur in mineral deposits on rocky bodies, or be produced synthetically via high-temperature processes, electrolysis, or nuclear transmutation in advanced settings. Purification emphasizes containment due to reactive and corrosive nature.

Applications and safety: Halogenion is often explored as a driver of energy transfer, advanced electronics, or propulsion concepts in speculative scenarios. Real-world portrayals emphasize hazards such as corrosivity, toxicity, and rapid moisture reactivity, requiring robust containment and inert atmospheres.