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Noun1.lanthanon - any element of the lanthanide series (atomic numbers 57 through 71)
group, grouping - any number of entities (members) considered as a unit
terbium metal - a separate group of related lanthanides, including terbium, europium, gadolinium, and sometimes dysprosium
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References in periodicals archive ?
Chen, Catalytic Synthesis of Trichloro Salicylic Acid Amyl Ester by Lanthanon Solid Superacid Gd 3+ -SiO 2 /ZrO 2 , Contemporary Chemical Industry, 35, 100 (2006).
However, compared with the transition metal-BTB frameworks reported, the lanthanon metal-BTB frameworks are less studied (14).
An account by Seaborg of how he proposed (against strong opposition) that elements 90 to 92 represented the start of an analogous series to the lanthanons. The relation of Period to orbital filling.