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Periodic Table of the Elements: Roentgenium

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Periodic Table of the Elements: Roentgenium
Atomic Number:111
Atomic Symbol:Rg
 Roentgenium roentgenium, artificially produced radioactive chemical element; symbol Rg; at. no. 111; mass number of most stable isotope 272; m.p., b.p., sp. gr., and valence unknown.
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Atomic Weight:(272)
Electron Configuration:2 · 8 · 18 32 · 32 18 · 1


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