Francium has seven electron shells.
That depends on the atom Hydrogen has only one while francium has 7
Francium doesn't exist in air.
Francium doesn't exist in the environment.
Francium can be solid, liquid or gaseous.
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.
No
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 exist in infinitesimal traces in thorium and uranium ores.