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EncyclopediaPeriodic Table of the Elements: Promethium| Atomic Number: | 61 | | Atomic Symbol: | Pm | | | Promethium | | Atomic Weight: | (145) | Electron
Configuration: | 2 · 8 · 18
23 · 8 · 2 | The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2007, Columbia University Press. All rights reserved. More on Periodic Table of the Elements Promethium from Infoplease:
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