Francium is a radioacive chemical element; francium is natural but also may be prepared in laboratory.
Francium is a natural, radioactive chemical element; but francium can be prepared also in laboratory.
All isotopes of francium are radioactive.
Francium is a radioactive element.
Francium (Fr) is a natural radioactive element, extremely rare.
Francium is radioactive, unstable and scarce.
Francium is radioactive.
Francium is a natural chemical element.
Fr is the symbol for the radioactive element francium.
Francium is a "radioactive" element.
Francium is a radioactive element supporting radioactive disintegration.
Francium has an extremely short half life of about 20 minutes so no it is not. Radioactive lasers do not use radioactive materials anyway.
These effects were not studied for francium but because francium is very radioactive it is harmful.
As a strongly radioactive element francium is dangerous.