lutecium

Lutetium is a rare, silver-gray element with the chemical symbol Lu and atomic number 71. It belongs to the lanthanide series, often called rare earth metals, though it is actually quite stable and not as rare as other lanthanides. Lutetium is used in scientific and technological applications, such as in certain types of catalysts, medical imaging, and phosphors for LED lights. It is usually obtained from mineral sources and is valued for its stability and unique electronic properties. Despite its rarity, lutetium plays a significant role in advancing high-tech materials and medical technologies.