It is supposed that francium react with water more easy than any other element.
- francium is extremely radioactive- the total quantity of francium on the Earth is approx. 30 g- the chemical and physical properties of francium are only estimated, not measured
Francium is a radioactive element.
Francium is very radioactive, unstable, difficult to be prepared, difficult to be manipulated.
The chemistry of francium is not known; francium has properties similar to caesium.
Francium is a radioacive chemical element; francium is natural but also may be prepared in laboratory.
All isotopes of francium are radioactive.
Francium is radioactive, unstable and scarce.
Francium is radioactive.
Francium is radioactive and rubidium not. Also the electron configuration, atomic number, physical properties, hazards etc. are different.
Francium (Fr) is a natural radioactive element, extremely rare.
Fr is the symbol for the radioactive element francium.
These effects were not studied for francium but because francium is very radioactive it is harmful.