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Rare Earth Elements

Elements in the Rare Earth Element Group

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Samarium is one of the rare earth elements.

Samarium is one of the rare earth elements.

JKleo, wikipedia.org
This is a list of rare earth elements, which are metals. The CRC Handbook of Chemistry and Physics and IUPAC list the rare earths as consisting of the lanthanides, plus scandium and yttrium:

Lanthanum (sometimes considered a transition metal)
Cerium
Praseodymium
Neodymium
Promethium
Samarium
Europium
Gadolinium
Terbium
Dysprosium
Holmium
Erbium
Thulium
Ytterbium
Lutetium
Scandium
Yttrium

Other sources consider the rare earths to be the lanthanides and actinides:

Lanthanum (sometimes considered a transition metal)
Cerium
Praseodymium
Neodymium
Promethium
Samarium
Europium
Gadolinium
Terbium
Dysprosium
Holmium
Erbium
Thulium
Ytterbium
Lutetium
Actinium (sometimes considered a transition metal)
Thorium
Protactinium
Uranium
Neptunium
Plutonium
Americium
Curium
Berkelium
Californium
Einsteinium
Fermium
Mendelevium
Nobelium
Lawrencium

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