rare earth s, also known as rare earth metals, with atomic numbers and chemical s. a set of 17 heavy metals

rare earth elements metals atomic numbers chemical symbols set heavy consisting lanthanides yttrium scandium 17 atomic number chart chemical chemistry component critical critical materials earth electrical electronic element elements english group heavy metal industrial lanthanide lanthanides material metals mineral minerals name periodic periodic system table production rare rare-earth raw raw ree research scandium science set seventeen shortage symbol technology technology-critical vector