Francium can be solid, liquid or gaseous.
Francium doesn't exist in air.
Francium doesn't exist in the environment.
Francium exist in uranium and thorium ores but it is not exploitable.
Any link exist between francium and the economy.
Francium hasn't ores; infinitesimal amounts of francium exist in some uranium ores.
Natural francium exist in uranium and thorium ores.Artificial francium is obtained in particle accelerators.
Francium exist only in infinitesimal concentrations in uranium ores; the identification of francium is very difficult.
Impossible; francium hasn't ores - infinitesimal amounts of francium exist in some uranium ores.
Francium has seven electron shells.
Francium exist in infinitesimal traces in thorium and uranium ores.
Francium sulfide is the compound that contains francium and sulfur.
Francium exist in infinitesimal concentrations in uranium and thorium ores.