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     57    

57 La Lanthanum

Transition metal, mass: 138.91 u, 1 stable isotope (139), abundance rank (earth/space): 36/58

Click image to magnify. 1.5 grams pure lanthanum. Original size in cm: 1 x 1
Lanthanum Lanthanum pieces
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 used in optical lenses, alloys for special applications and in some batteries. In nature, it always occurs in compounds.

Lanthanum oxidized
Five years later: even in an argon filled glas ampoule, the lanthanum found something to react with and formed an oxide layer.


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