Periodic Table of the Elements: Actinium — Infoplease.com

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Periodic Table of the Elements: Actinium
Atomic Number:	89
Atomic Symbol:	Ac
	Actinium
Atomic Weight:	227.0278
Electron Configuration:	2 · 8 · 18 32 · 18 9 · 2

The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2007, Columbia University Press. All rights reserved.

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