Francium has any use.
Francium hasn't practical uses.
Francium has any uses.
Francium has not uses.
Francium has no uses. There are currently no uses for francium outside of basic scientific research.
Francium hasn't practical uses.
Francium has any uses.
Francium hasn't practical uses.
Francium is not an important chemical element.
Francium hasn't practical uses.
Francium (was) is used only for studies in research laboratories.
Francium has not now practical applications; francium is used only for scientific studies.
Francium has not practical uses; it was used for studies in spectroscopy and quantum chemistry.