Unbinilium (Ubn)
SuperactinideMasse atomique relative standard
N/DConfiguration électronique
[Og] 8s²Point de fusion
N/DPoint d’ébullition
N/DMasse volumique
N/DÉtats d’oxydation
++2, ++4Électronégativité (Pauling)
N/DÉnergie d’ionisation (1re)
563,3 eVAnnée de découverte
N/DRayon atomique
N/DUnbinilium is the temporary systematic name for element 120, an undiscovered superheavy element. It is expected to lie below radium in group 2 and is often described as eka-radium, but all chemical and physical properties remain predicted. Relativistic effects should be large and may make its bonding and reactivity depart from simple alkaline-earth trends. No confirmed isotope, natural occurrence, or macroscopic sample is known.
This element has not been synthesized or experimentally confirmed. All listed physicochemical properties are calculated, extrapolated, or model-dependent.
The appearance of unbinilium is unknown because no atoms have been confirmed and no bulk sample exists. If a sufficiently long-lived bulk material could be made, it is predicted to be a metal, but its color, density, crystal structure, melting point, and other ordinary properties are unobserved.
Unbinilium has no confirmed commercial, industrial, medical, or technological use. Its only foreseeable use would be in basic nuclear and chemical research, especially studies of superheavy-element synthesis, decay chains, nuclear shell effects, and relativistic chemistry. Any experiments would involve single atoms or very small numbers of atoms, not usable quantities of material.
No compound of unbinilium has been made or observed. Calculations generally predict a dominant +2 oxidation state, analogous to heavier alkaline-earth chemistry, with possible species such as unbinilium fluoride (UbnF₂), unbinilium chloride (UbnCl₂), unbinilium oxide (UbnO), and unbinilium hydride (UbnH₂). The stability, volatility, and bonding of these compounds are uncertain because relativistic effects and nuclear lifetimes would strongly constrain experiments.
The safety properties of unbinilium are not experimentally known. Any isotope, if synthesized, is expected to be radioactive and short-lived, so the principal hazard would be ionizing radiation from decay products rather than ordinary chemical exposure. The quantities involved in research would be atom-at-a-time, but accelerator targets and reaction products would require radiological controls.
No confirmed natural occurrence of unbinilium is known, and environmental behavior has not been observed. Predicted isotopes would decay far too quickly to participate in ordinary geochemical or biological cycles. If atoms were produced in a laboratory, they would remain confined to experimental apparatus and decay into lighter nuclei.
Unbinilium has no commodity market, no practical supply chain, and no recoverable source. Production, if achieved, would require heavy-ion fusion in specialized accelerators using rare actinide targets and intense projectile beams, with expected yields of at most a few atoms. Candidate reactions have involved combinations such as titanium or chromium ions with californium, curium, or plutonium targets, but no confirmed synthesis has established an isotope. Costs are therefore research-program costs, not material prices.
Unbinilium has not been detected in Earth materials or extraterrestrial samples. Very heavy nuclei may be formed transiently in extreme neutron-rich astrophysical events, but element 120 has no confirmed cosmic abundance. Predicted islands of enhanced nuclear stability are a motivation for searches, not evidence for natural persistence.
- Unbinilium is still named by the IUPAC temporary systematic naming convention.
- Element 120 would begin the eighth period in many extended periodic-table layouts.
- Its expected chemistry is influenced by the relativistic stabilization of the 8s electrons.
- A successful synthesis would probably be identified through correlated radioactive decay chains, not by weighing or isol
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Propriétés
Propriétés physiques
N/D
Propriétés chimiques
- Affinité électronique
- 0,02 eV
- Énergie d’ionisation (1re)
- 563,3 eV Comparer : Énergie d’ionisation (1re) de tous les éléments →
- États d’oxydation
- ++2, ++4 Comparer : États d’oxydation de tous les éléments →
- Configuration électronique
- [Og] 8s²
Propriétés thermodynamiques
N/D
Propriétés nucléaires
- Protons
- 120 Comparer : Protons de tous les éléments →
- Isotopes connus
- 0 Comparer : Isotopes connus de tous les éléments →
- Isotopes stables
- 0 Comparer : Isotopes stables de tous les éléments →
- Présence à l’état naturel
- Non observé
Abondance
N/D
Sécurité
- Radioactif
- Oui
Structure cristalline
N/D
Structure électronique
- Électrons par couche
- 2, 8, 18, 32, 32, 18, 8, 2 Comparer : Électrons par couche de tous les éléments →
Identifiants
- Numéro CAS
- 54143-58-7 Comparer : Numéro CAS de tous les éléments →
Configuration électronique Prédit
——Données de configuration électronique indisponibles pour cet ion.
Modèle atomique
Les isotopes diffèrent par leur nombre de neutrons, leur masse et leur stabilité — pas par la configuration électronique de l’atome neutre.
N/D
Modèle atomique schématique, non à l’échelle.
Empreinte atomique
Spectre d’émission / d’absorption
Distribution isotopique
Aucun isotope stable.
| Nombre de masse | Masse atomique (u) | Abondance naturelle | Demi-vie |
|---|
Phase / État
Données de phase ou d’état indisponibles
N/D
Données de phase ou d’état indisponibles