아인슈타인
아인슈타인 · einsteinium atom
식별자 및 물리적 특성
| CAS No. | 7429-92-7 |
|---|---|
| 분자식 | Es |
| 평균 분자량 | 252.083 g/mol |
| 단동위원소 질량 | 252.083 g/mol |
| SMILES | [Es] |
| InChIKey | CKBRQZNRCSJHFT-UHFFFAOYSA-N |
| PubChem CID | 23913 |
| ChEBI | CHEBI:33393 |
| DTXSID | DTXSID30225305 |
| 현지명 | 아인슈타인 |
화학 및 물리적 성질
| 극성 표면적 | 0 |
|---|---|
| 수소 결합 공여자 수 | 0 |
| 수소 결합 수용자 수 | 0 |
| 회전 가능 결합 수 | 0 |
| 무거운 원자 수 | 1 |
| 형식 전하 | 0 |
| 복잡도 | 0 |
| 물질 분류 | Physical/Radiation -> Radionuclides |
| SpringerMaterials Properties | nuclear state |
| Physical Description | A metal with a melting point of about 860 degrees C[Merck Index] |
| 녹는점 | 860 ±50° |
| 밀도 | 8.84 |
| 물리적 상태 | 금속 형태 |
| 색상 | metalcubic |
| Bulk Modulus | 15.0 GPa, Estimated |
화학적 성질
man-made radioisotope; identified by Ghiorso and colleagues at Berkeley in December 1952, as part of debris from first large thermonuclear explosion; chemical properties similar to those of holmium; ionic radius of Es+++ is 0.0925 nm; has lowest enthalpy of vaporization of any of the divalent elements; cub, a=0.575 nm; discovered in 1952; t1/2 of 253Es is 20.5 days, t1/2 of 254Es is 276 days, t1/2 of 255Es is 40 days [HAW93] [KIR78]
안전 및 규제
| 유해성 요약 | Most Important Radionuclide: Es-254 Source: Neutron bombardment of plutoniumHalf-Life: 472 days Lung Clearance Half-Time: Weeks Internal Toxicity: Very High Annual Limit on Intake: 0.00002 mCi[See Glossary for references.] See Radiation, ionizing. |
|---|
용도
역사
The name of Es derives from “Albert Einstein”, the Geituan born physicist who proposed the theory of relativity. A collaboration of American scientists G. R. Choppin, S. G. Thompson, A. Ghiorso, and B. G. Harvey, from the Argonne National Laboratory near Chicago, Illinois, the Los Alamos Scientific Laboratory in Los Alamos, New Mexico and at the University of California lab in Berkeley, CA, first found 252Es in the radioactive debris from the first large thermonuclear bomb explosion, nicknamed “Mike,” which took place at Enewetak atoll, Marshall Islands in the Pacific on November 1, 1952. The longest halflife associated with this unstable element is 472 day 252Es.