Moscovium (Mc)
post-transition-metalExpected to be a Solid
標準原子量
[289]電子配置
[Rn] 7s2 7p3 5f14 6d10 (予測値)融点
396.85 °C沸点
1126.85 °C密度
1.35e+4 kg/m³酸化数
+1, +3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
2004原子半径
187 pm詳細
Moscovium is a synthetic transactinide element in group 15, below bismuth. It has been made only atom by atom in heavy-ion fusion experiments, and all confirmed isotopes are highly radioactive and short-lived. Its chemistry has not been directly characterized in bulk; relativistic calculations predict a very heavy p-block metal with chemistry differing from lighter pnictogens, probably favoring the +1 and +3 oxidation states more than a stable +5 state.
Moscovium does not occur naturally in the Earth’s crust. The name moscovium and the symbol Mc, are the accepted ones for element 115. The name is in recognition of the Moscow region and honors the ancient Russian land that is home to the Joint Institute for Nuclear Research (JIRN), where the discovery experiments were conducted using the Dubna gas filled recoil separator in combination with the heavy ion accelerator capabilities of the Flerov Laboratory of Nuclear Reactions.
48Ca and 243Am were bombarded together in a cyclotron during a series of experiments from 14 July to 10 August 2003 (Fig. IUPAC.115.1). In February 2004, the results from these experiments were released in a report that stated “ununpentium” had been synthesized. This initial name means “115” in the IUPAC systematic naming scheme, which combines Latin and Greek names to produce un-un-pentium for 115. Moscovium has no known isotopic applications aside from scientific research.
On February 2, 2004, scientists working at the Joint Institute for Nuclear Research in Dubna, Russia, along with scientists from the U.S. Department of Energy's Lawrence Livermore National Laboratory and Oak Ridge National Laboratory, announced the creation of moscovium. In experiments performed between July 14, 2003 and August 10, 2003, atoms of americium-243 were bombarded with ions of calcium-48 using a device called a cyclotron. This produced one atom of moscovium-287 and three atoms of moscovium-288. All four atoms quickly decayed into other elements. Moscovium's most stable isotope, moscovium-289, has a half-life of about 220 milliseconds. It decays into nihonium-285 through alpha decay.
On Novemer 28th, 2016, element 115 was named Moscovium with the symbol Mc. Moscovium is the Moscow region of Russia, which is home to much of Russia’s superheavy element research. Muscovium was discovered by together by the Joint Institute for Nuclear Research, Dubna (Russia), Oak Ridge National Laboratory (USA), Vanderbilt University (USA) and Lawrence Livermore National Laboratory (USA).
No macroscopic sample of moscovium has ever been prepared, so its appearance is unknown. Calculations usually treat it as a dense metallic solid under ordinary conditions, but color, texture, melting point, and other bulk properties remain predicted rather than observed.
Moscovium has no practical commercial, industrial, medical, or consumer use. Its only use is in nuclear research, where individual atoms and their decay chains test models of superheavy-element stability, nuclear shell effects, and alpha-decay systematics. Moscovium isotopes are also important as links in decay chains leading to other superheavy nuclides, including nihonium produced by alpha decay of moscovium.
Since only a few atoms of moscovium have ever been produced, it currently has no uses outside of basic scientific research.
No confirmed compound of moscovium has been isolated or chemically characterized. Predictions place it in the pnictogen family but with strong relativistic effects that may make its valence behavior unlike that of nitrogen, phosphorus, arsenic, antimony, and bismuth. The +1 oxidation state is expected to be comparatively important, and +3 may also be accessible; +5 is predicted to be less stable. Hypothetical species such as moscovium(I) chloride, McCl, and moscovium(III) chloride, McCl₃, are discussed in theoretical chemistry only.
See more information at the Moscovium compound page.
The safety hazards of moscovium are dominated by radioactivity, not conventional chemical toxicity. Known isotopes decay mainly by alpha emission and spontaneous fission pathways within very short times, with isotope-specific half-lives. Quantities produced are far below macroscopic handling amounts, but any experiment requires heavy-element radiochemistry controls, shielding appropriate to decay products, and contamination prevention.
Moscovium has no confirmed natural occurrence and no environmental cycle. Atoms produced in laboratories decay rapidly to daughter nuclides, so persistence as moscovium in air, water, soil, or organisms is not expected. Any environmental relevance would be limited to controlled accelerator facilities and the management of radioactive targets, residues, and decay products.
Moscovium has no commodity market, no industrial supply chain, and no recoverable stock. It is produced only in specialized accelerator experiments by bombarding rare actinide targets with heavy ions, for example using americium targets and calcium beams. The limiting factors are accelerator time, target preparation, nuclear reaction cross sections, detector capability, and radiological controls, not ordinary mining, refining, demand, or substitution economics.
Made by bombarding americium-243 with calcium-48.
Moscovium is not expected to have a lasting natural cosmic abundance. Any atoms formed in energetic nucleosynthesis or high-energy particle events would decay quickly compared with astronomical timescales. It has not been identified in stars, meteorites, planets, or interstellar material; its significance is mainly as a laboratory probe of the superheavy region near predicted nuclear shell stabilization.
- The first published moscovium decay chains were produced using ²⁴³Am targets and ⁴⁸Ca projectiles.
- Its name refers to the Moscow region, recognizing the role of the Joint Institute for Nuclear Research in Dubna.
- Moscovium isotopes can decay to nihonium by alpha emission.
- Only a few atoms are needed to establish a decay chain, but repeated events are required for confident assignment.
- Its periodic-table position suggests group 15 chemistry, yet relativistic effects are expected to be large.
画像
性質
物理的性質
- 原子半径（経験値）
- 187 pm 全元素の原子半径（経験値）を比較 →
- 密度
- 1.35 × 104 kg/m³ 全元素の密度を比較 →
- 標準温度・圧力（STP）での相
- 固体 全元素の標準温度・圧力（STP）での相を比較 →
- 融点
- 396.85 °C 全元素の融点を比較 →
- 沸点
- 1126.85 °C 全元素の沸点を比較 →
化学的性質
- 電子親和力
- 0.3 eV
- 酸化数
- +1, +3 全元素の酸化数を比較 →
- 価電子
- 5 全元素の価電子を比較 →
- 電子配置
- [Rn] 7s2 7p3 5f14 6d10 (予測値)
熱力学的性質
データなし
原子核
- 陽子数
- 115 全元素の陽子数を比較 →
- 中性子数
- 177 全元素の中性子数を比較 →
- 既知の同位体
- 6 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 →
- 質量数（最も安定な同位体）
- 289
- 最も安定な同位体
- Mc-292
- 発見年
- 2004
存在度
データなし
結晶構造
データなし
電子構造
- 各電子殻の電子数
- 14, 10, 5 全元素の各電子殻の電子数を比較 →
識別子
- CAS登録番号
- 54085-64-2 全元素のCAS登録番号を比較 →
- InChI
- InChI=1S/Mc
- InChI Key
- QDXZEHQJHSHEQF-UHFFFAOYSA-N
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 |
|---|---|---|---|
| 290 放射性 | 290.19598 ± 0.00073 | データなし | 840 ms |
| 289 放射性 | 289.19363 ± 0.00089 | データなし | 410 ms |
| 288 放射性 | 288.19274 ± 0.00062 | データなし | 177 ms |
| 287 放射性 | 287.1907 ± 0.00052 | データなし | 60 ms |
| 292 放射性 | 292.200323 ± 0.000751 | データなし | 5 秒 |
相／状態
理由: 融点（396.85 °C）より371.9 °C低い
模式図、実際の縮尺とは異なります
相転移点
密度
標準条件下
標準条件下
結晶構造のデータはありません
同位体 (5)
| 質量数 | 原子質量（u） | 天然存在比 | 半減期 | 崩壊形式 | |
|---|---|---|---|---|---|
| 290 放射性 | 290.19598 ± 0.00073 | データなし | 840 ms | α =100% | |
| 289 放射性 | 289.19363 ± 0.00089 | データなし | 410 ms | α =100% | |
| 288 放射性 | 288.19274 ± 0.00062 | データなし | 177 ms | α =100% | |
| 287 放射性 | 287.1907 ± 0.00052 | データなし | 60 ms | α =100% | |
| 292 放射性 | 292.200323 ± 0.000751 | データなし | 5 秒 | α ?SF ? |
詳細な性質
共有結合半径（詳細）
- 共有結合半径（Pyykkö）
- 162 pm
番号付けの尺度
- Mendeleev
- 98
分極率と分散
- 双極子分極率
- 71 a.u.
- 双極子分極率（不確かさ）
- 20 a.u.
専門参考データ
同位体の崩壊形式 (8)
| 同位体 | モード | 強度 |
|---|---|---|
| 287 | A | 100% |
| 288 | A | 100% |
| 289 | A | 100% |
| 290 | A | 100% |
| 291 | A | — |
| 291 | SF | — |
| 292 | A | — |
| 292 | SF | — |
追加データ
Estimated Crustal Abundance
The estimated element abundance in the earth's crust.
Not Applicable
参考文献 (1)
- [5] Moscovium https://education.jlab.org/itselemental/ele115.html
Estimated Oceanic Abundance
The estimated element abundance in the earth's oceans.
Not Applicable
参考文献 (1)
- [5] Moscovium https://education.jlab.org/itselemental/ele115.html
参考文献
(8)
Data deposited in or computed by PubChem
The half-life and atomic mass data was provided by the Atomic Mass Data Center at the International Atomic Energy Agency.
Element data are cited from the Atomic weights of the elements (an IUPAC Technical Report). The IUPAC periodic table of elements can be found at https://iupac.org/what-we-do/periodic-table-of-elements/. Additional information can be found within IUPAC publication doi:10.1515/pac-2015-0703 Copyright © 2020 International Union of Pure and Applied Chemistry.
The information are cited from Pure Appl. Chem. 2018; 90(12): 1833-2092, https://doi.org/10.1515/pac-2015-0703.
Thomas Jefferson National Accelerator Facility (Jefferson Lab) is one of 17 national laboratories funded by the U.S. Department of Energy. The lab's primary mission is to conduct basic research of the atom's nucleus using the lab's unique particle accelerator, known as the Continuous Electron Beam Accelerator Facility (CEBAF). For more information visit https://www.jlab.org/
The periodic table at the LANL (Los Alamos National Laboratory) contains basic element information together with the history, source, properties, use, handling and more. The provenance data may be found from the link under the source name.
The periodic table contains NIST's critically-evaluated data on atomic properties of the elements.
This section provides all form of data related to element Moscovium.