Unbihexium (Ubh)
SuperactinideStandard Atomic Weight
N/AElectron configuration
[Og] 5g⁶ 8s²Melting point
N/ABoiling point
N/ADensity
N/AOxidation states
N/AElectronegativity (Pauling)
N/AIonization energy (1st)
Discovery year
N/AAtomic radius
N/AUnbihexium is the temporary systematic name for the undiscovered element with atomic number 126. It lies in the predicted superheavy region beyond the known periodic table. No isotope has been confirmed, and all chemical and physical properties are theoretical. Nuclear models have treated Z=126 as a possible shell-related number, but predicted stability depends strongly on neutron number and on the model used.
This element has not been synthesized or experimentally confirmed. All listed physicochemical properties are calculated, extrapolated, or model-dependent.
Images
Properties
Physical
N/A
Chemical
- Electron affinity
- Electron configuration
Thermodynamic
N/A
Nuclear
- Protons
- 126
- 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, 38, 18, 8, 2
Identifiers
- CAS number
- 54576-77-1
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