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EncyclopediaPeriodic Table of the Elements: Helium| Atomic Number: | 2 | | Atomic Symbol: | He | | | Helium | | Atomic Weight: | 4.0026 | Electron
Configuration: | 2 | The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2007, Columbia University Press. All rights reserved. More on Periodic Table of the Elements Helium from Infoplease:
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