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EncyclopediaPeriodic Table of the Elements: Lanthanum| Atomic Number: | 57 | | Atomic Symbol: | La | | | Lanthanum | | Atomic Weight: | 138.9055 | Electron
Configuration: | 2 · 8 · 18
18 · 9 · 2 | The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2007, Columbia University Press. All rights reserved. More on Periodic Table of the Elements Lanthanum from Infoplease:
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