中文翻译与英英解释 | a radioactive element of the actinide series; found in uranium ores
同义词：Ac, atomic number 89,
|
| Actinium is a radioactive chemical element with symbol?Ac (not to be confused with the abbreviation for an acetyl group) and atomic number?89, which was discovered in 1899. It was the first non-primordial radioactive element to be isolated. |
例句与用法 | 1. | Actinium decay series
锕衰变系
|
|