rare earth element Definition

erbium, gadolinium, lanthanum, scandium, ytterbium, lanthanide, cerium, lanthanon, europium, dysprosium, terbium, neodymium, thulium, lutetium, praseodymium, promethium, samarium, holmium, gadolinia, helium, yttrium, actinium, atomic number 39, atomic number 69, atomic number 61, celtium, atomic number 21, atomic number 57, atomic number 58, atomic number 59, atomic number 60, atomic number 62, atomic number 63, atomic number 64, atomic number 65, atomic number 66, atomic number 67, atomic number 68, atomic number 70, atomic number 71, lutecium, calcium, monazite, rubidium, radium, didymium, silicon, argon, ether, rare earth, magnesium, xenon, essence, thorium, molybdenum, neon, uranium, lanthanide series, samarskite, abundance, strontium, radon, rees, bastnaesite, bastnasite, carl gustaf mossander, mosander, beryllium, terrene, anorthite, aluminum, carbon, chlorine, iron, nitrogen, gnome, aluminium, gallium, indium, rhenium, ruthenium, barium, quintessence, cadmium, iridium, palladium, rhodium, tantalum, tellurium, thallium, vanadium, chromium, polonium, columbium, misch metal, oxygen, caesium, osmium, tungsten, zirconium,