florentiumn.
/fləˈrɛnʃɪəm/ Chemistry.
A disused name for the element promethium n.
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illinium1926
florentium1927
promethium1948
1927 Chem. Abstr. 21 1209 The exact text of the original sealed note..shows that it contains..the proposal to name the new element florentium (florenzio), with the symbol Fr.
1939 Nature 9 Dec. 959/1 The existing data about No. 61, which is called illinium or florentium, are derived from X-ray spectral lines in the L- and K- series.
1962 F. A. Cotton & G. Wilkinson Adv. Inorg. Chem. xxxi. 871 As early as 1926, several groups of workers reported optical and X-ray evidence for the existence of element 61 in various lanthanide concentrates, and the names Illinium, Il, and Florentium, Fl, were proposed by workers at the Universities of Illinois and Florence.
This entry has not yet been fully updated (first published 1972; most recently modified version published online March 2021).
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n.1927