31. The lanthanide elements are the group of elements with atomic number increasing from 57 ( lanthanum ) to 71 ( lutetium ). 32. The ionic radius drops from 103 pm for lanthanum ( III ) to 86.1 pm for lutetium ( III ). 33. The ionic radius drops from 102 pm for cerium ( III ) to 86.1 pm for lutetium ( III ). 34. All of these researchers found lutetium as an impurity in the mineral ytterbia, which was previously thought to consist entirely of ytterbium. 35. Aqueous solutions of most lutetium salts are colorless and form white crystalline solids upon drying, with the common exception of the iodide. 36. Currently, the most promising high-index lens material is lutetium aluminum garnet, with a refractive index of 2.14. 37. Yttrium ( III ) oxide and lutetium ( III ) oxide exhibit weak basic character, but scandium ( III ) oxide is basic. 38. The isotopes of lutetium range in atomic weight from 149.973 ( 150 Lu ) to 183.961 ( 184 Lu ). 39. This treatment involves attaching a radionuclide ( Lutetium -177 or Yttrium-90 ) to a somatostatin analogue ( octreotate or octreotide ). 40. Sessler said he has seen evidence that Lutetium Texaphyrin can destroy a brain tumor, but the drug may be years away from government approval.
