francium

Domaine: chimiechimie minérale
Date: 1983

Terme :

francium n. m.

Traductions

anglais
Date : 1983
Définition

An element. State: solid; group: IA; Atomic Wt.: 223(?); atomic no.: 87; valence: 1. Francium is a radioactive metal having no stable form. Its existence as a decay product of actinium was discovered in 1939 by the french scientist Marguerite Perey (1910-1975). Its longest-lived isotope (223) is the only one that occurs naturally, with a half-life of 21 minutes. It forms no compounds. Francium is the haviest of the alkali metal group.

Termes :
1. francium
2. Fr