111
Rg
Roentgenium
Roentgenium
Roentgenium (Rg)
Transition Metals · Expected to be a solid · Period 7 · Group 11
Element Properties
- Atomic Number
- 111
- Symbol
- Rg
- Atomic Mass
- 282.169
- Category
- Transition Metals
- Standard State
- Expected to be a solid
- Period
- 7
- Group
- 11
- Electronegativity
- —
- Atomic Radius
- —
- Ionization Energy
- —
- Electron Affinity
- —
- Oxidation States
- 5, 3, 1, -1
- Melting Point
- —
- Boiling Point
- —
- Density
- —
- Electron Configuration
- [Rn]7s2 5f14 6d9 (predicted)
- Year Discovered
- 1994
Electron shells
[Rn]7s2 5f14 6d9 (predicted)
Electrons are arranged in shells (principal energy levels) around the nucleus. The diagram is a schematic — orbitals in the same shell are not drawn separately.
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Frequently asked questions
What is the atomic number of Roentgenium?
The atomic number of Roentgenium is 111, which equals the number of protons in its nucleus.
What is the atomic mass of Roentgenium?
The atomic mass of Roentgenium is approximately 282.169 u (one twelfth of the mass of a carbon-12 atom).
What is the electron configuration of Roentgenium?
The electron configuration of Roentgenium is [Rn]7s2 5f14 6d9 (predicted).
Where is Roentgenium in the periodic table?
Roentgenium is located in period 7, group 11.
When was Roentgenium discovered?
Roentgenium was discovered in 1994.