A chemical element which the Swedish physicist J. R. Rydberg conjectured to exist between hydrogen and helium in the periodic table, based on spectral lines which I. S. Bowen later showed to be forbidden lines in ionized nitrogen and oxygen. See also coronium.

J. R. Rydberg.
The ordinals of the elements and the highfrequency spectra.
Philosophical Magazine. 6th series, vol. 28, page 144 (1914).

Wolfgang Pauli.
Rydberg and the periodic system of the elements.
Proceedings of the Rydberg Centennial Conference on Atomic Spectroscopy.
Papers and abstracts, edited by Bengt Edlèn.
Kungl. Fysiografiska sällskapets handlingar, n. f., bd. 65, nr. 21.
Lund: C.W.K.Gleerup, [1955].

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