All in all, they discovered 118 lanthanide anion states, 63 of which were new.
From the sciencedaily.com
All the trivalent lanthanide ions, except lutetium, have unpaired f electrons.
From the en.wikipedia.org
Lanthanide ions have notable luminescent properties due to their unique 4f orbitals.
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The term lanthanide was probably introduced by Victor Goldschmidt in 1925.
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The informal chemical symbol Ln is used in general discussions of lanthanide chemistry.
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This 15000 tons corresponds to about 85% of the lanthanide production.
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The new agent is a compound incorporating a lanthanide chelate and a phenylboronate group substance.
From the sciencedaily.com
Such cerium-depleted light lanthanide mixtures have been widely used to make petroleum-cracking catalysts.
From the en.wikipedia.org
However, the lanthanide rare earths contain elements of even atomic number and many stable isotopes.
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More examples
Rare earth: any element of the lanthanide series (atomic numbers 57 through 71)
Any of the 14 rare earth elements from cerium (or from lanthanum) to lutetium in the periodic table; because their outermost orbitals are empty, they have very similar chemistry; below them are the actinides
(Lanthanides) This is a group of fifteen closely related elements and are known as the rare earth or "inner transition" elements. They are so alike that they are difficult to seperate from each other and usually all occur together in nature.
Any element in the 4f block of the periodic table from (57) La to (70) Yb
An element in the first row of the f-block. Example: Europium, Erbium.