111Unknown properties · Group 11 · Period 7
Roentgenium
Roentgenium (Rg) is element 111, a unknown properties in the d-block — group 11, period 7. It is a solid at room temperature with 7 electron shells (2, 8, 18, 32, 32, 17, 2) and an atomic mass of 282 u.
- Atomic mass
- 282.0 u
- Phase · STP
- solid
- Melting
- —
- Boiling
- —
- Electronegativity
- —
- Density
- 28.7 g/cm³
Photograph — Chemical Elements A Virtual Museum under a Creative Commons Attribution 3.0 Unported License, source: https://images-of-elements.com/roentgenium.php
Identity
- Atomic number
- 111
- Standard atomic weight
- 282.0 u
- Category
- Unknown properties
- Group
- 11
- Period
- 7
- Block
- d-block
- Oxidation states
- 5, 3, 1, -1
Physical properties
- Melting point
- —
- Boiling point
- —
- Density
- 28.7 g/cm³
- Molar heat capacity
- —
- Atomic radius
- —
- Electron affinity
- 151 kJ/mol
Atomic structure
111protons
171neutrons
111electrons
2valence e⁻
- Noble-gas notation
- *[Rn] 5f14 6d10 7s1
- Full configuration
- 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f14 6d9
- Electrons per shell
- 2, 8, 18, 32, 32, 17, 2
Periodic trends
Where Roentgenium ranks across all 118 elements.
Discovery
- Discovered
- 1994
- Discovered by
- Gesellschaft für Schwerionenforschung
- Named by
- —
- Appearance
- —