Periodic Table of the Elements: Roentgenium — Infoplease.com

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Periodic Table of the Elements: Roentgenium
Atomic Number:	111
Atomic Symbol:	Rg
	Roentgenium
Atomic Weight:	(272)
Electron Configuration:	2 · 8 · 18 32 · 32 18 · 1

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

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Nothing new under the sun? That does not apply in chemistry, where every few years there is an addition to the periodic table of elements.(The Week)(Brief article) (National Review)

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