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Rare Earth: Laser
| There are 17 metallic elements that make up the rare earths. You will find them, with the atomic numbers 21, 39, and 57–71, in the middle of the periodic table. These metals have unusual fluorescent, phosphorescent, conductive and magnetic properties—which make them very useful when alloyed, or mixed, in small quantities with less uncommon metals, such as iron. |
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