(1) The gadolinium and lutetium exceptions result in a marked increase in radius compared to the slight decrease in metal atom radius for the other elements.(2) This finding provides support for the ongoing development of more solubilized versions of lutetium texaphyrin as photosensitizers for use in the diagnosis and PDT of cancerous disease.(3) Because lutetium is so expensive (currently, about $75 a gram), it has almost no commercial use.(4) At least in the solid state, these latter are bound to the lutetium center as axial ligands.(5) In 1907 lutetium was extracted from ytterbia (and identified by the Latin name for Paris, where its isolator Georges Urbain was born).
