名詞 francium:

1. a radioactive element of the alkali-metal group discovered as a disintegration product of actinium
   同義詞：Fr, atomic number 87

fran.ci.um

n.Symbol Fr （名詞）符號 Fr
An extremely unstable radioactive element of the alkali metals, produced artificially from actinum or thorium, having approximately 9 isotopes, the most stable of which is Fr 223 with a half-life of 2 minutes. Atomic number 87; valence .See table at element
鈁：從堿金屬錒或釷中人工提煉出的一種極不穩(wěn)定的放射線元素，約有9種同位素，其中最穩(wěn)定的是半衰期為2分鐘的Fr223。原子序數(shù)為87；化合價為參見 element

來源：
After France
源自 France