Unbiunium (Ubu)
Superactinide标准原子量
暂无电子排布
[Og] 5g¹ 8s²熔点
暂无沸点
暂无密度
暂无氧化态
暂无电负性（鲍林）
暂无第一电离能
暂无发现年份
暂无原子半径
暂无Unbiunium is the temporary systematic name for element 121, symbol Ubu. It has not been confirmed by synthesis, and all chemical data are theoretical. In extended periodic-table models it is placed just beyond elements 119 and 120, often as an early superactinide or eka-actinium-like element. Relativistic electronic effects are expected to shape its valence chemistry, probably making the +3 state important, but no atom has been chemically studied.
This element has not been synthesized or experimentally confirmed. All listed physicochemical properties are calculated, extrapolated, or model-dependent.
No macroscopic sample of unbiunium exists, and its appearance has not been observed. Any description of color, luster, density, melting point, or crystal structure is only a theoretical prediction for a substance not yet made in bulk.
Unbiunium has no confirmed practical or commercial use. If produced, it would be made atom by atom for nuclear-physics research, mainly to test models of superheavy nuclei, shell stabilization, and decay chains beyond the known elements. Any chemical use is precluded by the absence of isolable quantities and by the expected short half-lives of accessible isotopes.
No compound of unbiunium has been prepared. Calculations generally treat it as a very heavy electropositive element whose chemistry may resemble an expanded version of actinium-group behavior, with Ubu³⁺ likely to be a significant ionic form. Hypothetical compounds such as unbiunium trifluoride (UbuF₃), unbiunium trichloride (UbuCl₃), or unbiunium oxide (Ubu₂O₃) are model species, not known substances. Lower oxidation states may be affected by relativistic stabilization of outer p orbitals, but their stability is uncertain.
There are no measured toxicological or radiological data for unbiunium. Any isotope that might be synthesized would be a superheavy radionuclide, with hazards determined by its isotope-specific half-life and decay modes. Realistic handling would be in shielded accelerator facilities at atom-at-a-time quantities, so radiation from the product atoms would be a research-control issue rather than an industrial exposure scenario.
Unbiunium has no confirmed natural occurrence and no observed environmental cycle. If individual atoms were formed artificially and released, their behavior would be dominated by radioactive decay long before ordinary geochemical transport could be characterized. Environmental properties such as solubility, sorption, and bioavailability are therefore unknown and only inferable from theoretical chemistry.
Unbiunium has no commodity market, no commercial supply chain, and no recycling stream. Production, if achieved, would require a heavy-ion accelerator, rare target material, and highly sensitive decay detection, with yields expected to be at the level of individual atoms. Costs would be those of fundamental nuclear research rather than material production. Substitution and demand are not meaningful because no technological application has been established.
No isotope of unbiunium is known in nature or in extraterrestrial material. Superheavy nuclei near this region may be discussed in models of rapid neutron-capture nucleosynthesis and the island of stability, but confirmed long-lived nuclides of element 121 are not known. Any primordial abundance, if it ever existed, is expected to be negligible unless unexpectedly long-lived isotopes exist.
- Unbiunium is a temporary systematic IUPAC name, not a discovery name.
- The temporary symbol Ubu would change if the element were officially named.
- No isotope of element 121 has a measured half-life.
- Predicted chemistry depends strongly on relativistic electronic structure.
- Element 121 is often discussed as an early superactinide.
- No confirmed natural atom of unbiunium has been reported.
图片
性质
物理性质
暂无
化学性质
- 电子亲和能
- 0.5 eV
- 电子排布
- [Og] 5g¹ 8s²
热力学性质
暂无
核性质
- 质子
- 121 比较所有元素的质子 →
- 已知同位素
- 0 比较所有元素的已知同位素 →
- 稳定同位素
- 0 比较所有元素的稳定同位素 →
- 天然存在形式
- 未观测到
丰度
暂无
安全
- 放射性
- 是
晶体结构
暂无
电子结构
- 各电子层电子数
- 2, 8, 18, 32, 33, 18, 8, 2 比较所有元素的各电子层电子数 →
标识符
- CAS登记号
- 54899-56-8 比较所有元素的CAS登记号 →
电子排布 预测值
——暂无该离子的电子排布数据。
原子模型
不同同位素的中子数、质量和稳定性不同，但中性原子的电子排布不变。
暂无
原子模型示意图，未按比例绘制。
原子指纹
发射 / 吸收光谱
同位素分布
无稳定同位素。
| 质量数 | 原子质量（u） | 天然丰度 | 半衰期 |
|---|
物相 / 状态
暂无物相/状态数据
暂无
暂无物相/状态数据