Periodic Table of the Elements: Lanthanum

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Periodic Table of the Elements: Lanthanum
Atomic Number:57
Atomic Symbol:La
 Lanthanumlanthanum
[Gr.,=to lie hidden], metallic chemical element; symbol La; at. no. 57; at. wt. 138.90547; m.p. about 920&degC;; b.p. about 3,460&degC;; sp. gr. 6.19 at 25&degC;; valence +3.
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Atomic Weight:138.90547
Electron Configuration:2 · 8 · 18 18 · 9 · 2