Ununennium (Uue)
SuperactinideStandard Atomic Weight
N/AElectron configuration
[Og] 8s¹Melting point
N/ABoiling point
N/ADensity
3 kg/m³Oxidation states
++1, ++3Electronegativity (Pauling)
0.86Ionization energy (1st)
Discovery year
N/AAtomic radius
240 pmUnunennium is the temporary IUPAC name for element 119, an undiscovered superheavy element placed below francium in group 1. All of its properties are predicted. It is expected to have an outer 8s electron and broadly alkali-metal-like chemistry, but strong relativistic effects may make it less simple than a direct extrapolation from cesium or francium. No isotope has been confirmed.
This element has not been synthesized or experimentally confirmed. All listed physicochemical properties are calculated, extrapolated, or model-dependent.
Images
Properties
Physical
- Atomic radius (empirical)
- 240 pm
- Covalent radius
- 272 pm
- Density
- Crystal structure
- BCC
Chemical
- Electronegativity (Pauling)
- 0.86
- Electron affinity
- Ionization energy (1st)
- Oxidation states
- ++1, ++3
- Electron configuration
Thermodynamic
N/A
Nuclear
- Protons
- 119
- Known isotopes
- 0
- Stable isotopes
- 0
- Natural occurrence
- not_observed
Abundance
N/A
Safety
- Radioactive
- Yes
Crystal Structure
N/A
Electronic Structure
- Electrons per shell
- 2, 8, 18, 32, 32, 18, 8, 1
Identifiers
- CAS number
- 54846-86-5
Electron Configuration Predicted
——Electron configuration data not available for this ion.
Atomic model
Isotopes change neutron count, mass, and stability — not the electron configuration of a neutral atom.
N/A
Schematic atomic model, not to scale.
Atomic Fingerprint
Emission / Absorption Spectrum
Isotope Distribution
No stable isotopes.
| Mass number | Atomic mass (u) | Natural abundance | Half-life |
|---|
Phase / State
Phase/state data not available
N/A
Phase/state data not available