Energy level diagram, Rare earth

• Er-O-Ti
• Al-Ce-O-Y
• F-Li-Lu-Pr
• Dy-O-P-Y
• Ba-Ce-Cl-Eu-O-P
• lanthanoid
• rare earth
• nonmetal
• chalcogen
• transitional
• cubic
• tetragonal
• monoclinic
• orthorhombic
• trigonal