Unbioctium (Ubo)
Superactinide標準原子量
データなし電子配置
[Og] 5g⁸ 8s²融点
データなし沸点
データなし密度
データなし酸化数
データなし電気陰性度（Pauling）
データなし第1イオン化エネルギー
データなし発見年
データなし原子半径
データなしUnbioctium is the temporary systematic name for element 128, a predicted superheavy element that has not been synthesized or observed. It would lie in the superactinide region of extended periodic tables. Its chemical character is unknown, because relativistic effects and the close spacing of 5g, 6f, 7d, and 8p levels make simple extrapolation unreliable. Any discussion of its properties is theoretical.
This element has not been synthesized or experimentally confirmed. All listed physicochemical properties are calculated, extrapolated, or model-dependent.
No macroscopic sample of unbioctium exists, and even single atoms have not been reported. Its color, density, melting point, crystal structure, and other bulk physical properties are therefore unknown. Published descriptions of appearance would be predictions only.
Unbioctium has no confirmed practical, commercial, medical, or industrial use. If it is ever produced, the initial use would be limited to nuclear-physics research, such as identifying decay chains, measuring half-lives, and testing models of superheavy nuclear stability. Chemical study would require atom-at-a-time methods and would depend on isotopes surviving long enough for separation or gas-phase experiments.
No compound of unbioctium has been made or detected. Its possible chemistry is inferred only from electronic-structure calculations for superheavy atoms. Models generally expect positive oxidation states if chemical reactions can be observed, but the likely range is not securely established. Relativistic orbital contraction and expansion may alter trends relative to lighter actinides and transactinides, so predicted fluorides, oxides, or coordination species should be treated as hypothetical rather than characterized substances.
The safety properties of unbioctium are not experimentally known. Any isotope that could be produced would almost certainly be radioactive and made in extremely small numbers of atoms. The practical hazard in a synthesis experiment would come mainly from accelerator operations, target materials, recoil separators, and decay radiation from short-lived products. Chemical toxicity cannot be assessed from observation.
There is no confirmed natural occurrence of unbioctium and no evidence for an environmental cycle. Any atoms produced in a laboratory would decay before they could disperse as a persistent contaminant. Environmental behavior such as solubility, adsorption, bioaccumulation, or mobility is therefore unmeasured and can only be modeled from uncertain chemical analogies.
Unbioctium has no commodity market, no recoverable source, and no supply chain. Production, if achieved, would require heavy-ion fusion experiments using specialized accelerators, rare targets, and sensitive detection systems. Yields would be expected to be atom-at-a-time, not material quantities. Economic discussion is therefore limited to the cost and feasibility of research campaigns, target preparation, beam time, and detector operation rather than trade in the element itself.
Unbioctium has not been identified in nature, meteorites, stellar spectra, or cosmic-ray material. Nuclei with this charge would be far beyond the long-lived primordial nuclides known on Earth. Astrophysical nucleosynthesis might transiently pass through very heavy nuclei in extreme neutron-rich events, but survival of element 128 to observable times is unconfirmed.
- Unbioctium is a systematic placeholder name, not a discovery name.
- No isotope of element 128 has been accepted as synthesized.
- Predicted chemistry is especially uncertain because several valence shells may be close in energy.
- A nucleus with 128 protons and 184 neutrons would have mass number 312.
- Any first identification would likely rely on correlated radioactive decays, not weighing a sample.
画像
性質
物理的性質
データなし
化学的性質
- 電子親和力
- 0.5 eV
- 電子配置
- [Og] 5g⁸ 8s²
熱力学的性質
データなし
原子核
- 陽子数
- 128 全元素の陽子数を比較 →
- 既知の同位体
- 0 全元素の既知の同位体を比較 →
- 安定同位体
- 0 全元素の安定同位体を比較 →
- 天然での存在
- 未観測
存在度
データなし
安全性
- 放射性
- はい
結晶構造
データなし
電子構造
- 各電子殻の電子数
- 2, 8, 18, 32, 40, 18, 8, 2 全元素の各電子殻の電子数を比較 →
識別子
- CAS登録番号
- 54576-79-3 全元素のCAS登録番号を比較 →
電子配置 予測値
——このイオンの電子配置データはありません。
原子モデル
同位体によって中性子数、質量、安定性は変わりますが、中性原子の電子配置は変わりません。
データなし
模式的な原子モデルです。実際の縮尺とは異なります。
原子の指紋
発光／吸収スペクトル
同位体分布
安定同位体はありません。
| 質量数 | 原子質量（u） | 天然存在比 | 半減期 |
|---|
相／状態
相・状態のデータはありません
データなし
相・状態のデータはありません