ac.tin.i.um

actinium的音标和读音：
DJ音标发音： [ækˈtini:əm]
KK音标发音： [ækˈtɪniəm]

actinium的词性：
n.Symbol Ac （名词）符号 Ac

1. A radioactive element found in uranium ores, used in equilibrium with its decay products as a source of alpha rays. Its longest lived isotope is Ac 227 with a half-life of 21.7 years. Atomic number 89; melting point 1,050⁼C; boiling point (estimated) 3,200⁼C; specific gravity (calculated) 10.07; valence 3.See table at element
锕：一种在铀矿中发现的放射性元素，作为阿尔法射线能源增入点用于与其衰变产物的平衡过程中，其最长的活同位素是半衰期为21.7年的锕227。原子序数为889；熔点为1,050摄氏度；（估计的）沸点为3,200摄氏度；（计算出的）比重为10.07；原子价为3参见 element