francium / ˈfræn si əm /

📖毕业后词汇钫钙钙质钙剂

francium 的定义

n. 名词 noun

Chemistry.

  1. a radioactive element of the alkali metal group. Symbol: Fr; atomic number: 87.

更多francium例句

  1. The last of the original 92 elements to be discovered was element 87, francium.