Periodic Table of the Elements: Roentgenium
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| Atomic Number: | 111 |
| Atomic Symbol: | Rg |
| Roentgeniumroentgenium, artificially produced radioactive chemical element; symbol Rg; at. no. 111; mass number of most stable isotope 280; m.p., b.p., sp. gr., and valence unknown. Situated in Group 11 of the periodic table, it is expected to have properties similar to those of gold. ..... Click the link for more information. | |
| Atomic Weight: | (280) |
| Electron Configuration: | 2 · 8 · 18 32 · 32 18 · 1 |