57 La Lanthanum
Transition metal, mass: 138.91 u, 1 stable isotope (139), abundance rank (earth/space): 36/58Click image to magnify. 1.5 grams pure lanthanum. Original size in cm: 1 x 1
Lanthanum is the prototype for the lanthanoids, elements 58 - 71. Like these, it is silvery in color and quite soft. If counted among them, it is the most reactive of those and the one with the highest atomic diameter. It is not often used, if, then mostly as additive in special alloys. In nature, it always occurs in compounds.
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Page last changed on October 11. 2009
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