Coronium was the name of a suggested chemical element, hypothesised in the 19th century. The name, inspired by the solar corona, was given by Gruenwald in 1887.[1] A new atomic thin green line in the solar corona was then considered to be emitted by a new element unlike anything else seen under laboratory conditions. It was later determined to be emitted by iron (Fe13+), so highly ionized that it was at that time impossible to produce in a laboratory.
- ^ Gruenwald, A. (2 December 1887). "On remarkable relations between the spectrum of watery vapour and the line spectra of Hydrogen and Oxygen". Chemical News. LVI (1462): 232 – via Google Books.