Rare earth
Rare earth is an oxide of a rare earth element. Often rare earth elements themselves are loosely called "rare earths".
Rare earth elements, or metals, are the Lanthanides and Actinides. They come from the f-block.
They are: Lanthanum, Cerium, Praseodymium, Neodymium, Promethium, Samarium, Europium, Gadolinium, Terbium, Dysprosium, Holmium, Erbium, Thulium, Ytterbium, Lutetium, Actinium, Thorium, Protactinium, Uranium, Neptunium, Plutonium, Americium, Curium, Berkelium, Californium, Einsteinium, Fermium, Mendelevium, Nobelium, Lawrencium.
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