Scandium, Yttrium, Lanathanum, Cerium, Praseodymium, Neodymium, Promethium, Samarium, Europium, Gadolinium, Terbium, Holmium, Dysprosium, Erbium, Thulium, Ytterbium, Lutetium.
Rare earth elements work best when they are added in small doses to composites and alloys.
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