{"thcode":2,"term":{"code":1489,"name":"lanthanide series elements","parent":1426,"scope":null},"uf":[{"name":"lanthanoid elements","usewith":false}],"bt":[{"code":1426,"name":"chemical element groups","parent":1382,"scope":"Groups shown at <http:\/\/periodic.lanl.gov\/>"},{"code":1382,"name":"elements","parent":1174,"scope":"Chemical elements and element groups"},{"code":1174,"name":"topics","parent":1,"scope":"Themes, subjects, and concerns for which USGS information resources are relevant."},{"code":1,"name":"Categories","parent":null,"scope":"Thematic terms for categorizing information resources.  This thesaurus is intended to support finding and understanding scientific information."}],"nt":[],"rt":[{"code":1423,"name":"cerium","parent":1427,"scope":"Rare earth (lanthanide series) element with symbol Ce and atomic number 58 <http:\/\/periodic.lanl.gov\/58.shtml>"},{"code":1444,"name":"dysprosium","parent":1427,"scope":"Rare earth (lanthanide series) element with symbol Dy and atomic number 66 <http:\/\/periodic.lanl.gov\/66.shtml>"},{"code":1447,"name":"erbium","parent":1427,"scope":"Rare earth (lanthanide series) element with symbol Er and atomic number 68 <http:\/\/periodic.lanl.gov\/68.shtml>"},{"code":1450,"name":"europium","parent":1427,"scope":"Rare earth (lanthanide series) element with symbol Eu and atomic number 63 <http:\/\/periodic.lanl.gov\/63.shtml>"},{"code":1459,"name":"gadolinium","parent":1427,"scope":"Rare earth (lanthanide series) element with symbol Gd and atomic number 64 <http:\/\/periodic.lanl.gov\/64.shtml>"},{"code":1474,"name":"holmium","parent":1427,"scope":"Rare earth (lanthanide series) element with symbol Ho and atomic number 67 <http:\/\/periodic.lanl.gov\/67.shtml>"},{"code":1490,"name":"lanthanum","parent":1427,"scope":"Rare earth (lanthanide series) element with symbol La and atomic number 57 <http:\/\/periodic.lanl.gov\/57.shtml>"},{"code":1497,"name":"lutetium","parent":1427,"scope":"Rare earth (lanthanide series) element with symbol Lu and atomic number 71 <http:\/\/periodic.lanl.gov\/71.shtml>"},{"code":1516,"name":"neodymium","parent":1427,"scope":"Rare earth (lanthanide series) element with symbol Nd and atomic number 60 <http:\/\/periodic.lanl.gov\/60.shtml>"},{"code":1545,"name":"praseodymium","parent":1427,"scope":"Rare earth (lanthanide series) element with symbol Pr and atomic number 59 <http:\/\/periodic.lanl.gov\/59.shtml>"},{"code":1546,"name":"promethium","parent":1427,"scope":"Rare earth (lanthanide series) element with symbol Pm and atomic number 61 <http:\/\/periodic.lanl.gov\/61.shtml>"},{"code":1553,"name":"rare earth elements","parent":1426,"scope":"A group of elements including the lanthanoids, or lanthanides, of interest because they are used in modern technological industries.  Yttrium and scandium are often included in this group."},{"code":1566,"name":"samarium","parent":1427,"scope":"Rare earth (lanthanide series) element with symbol Sm and atomic number 62 <http:\/\/periodic.lanl.gov\/62.shtml>"},{"code":1590,"name":"terbium","parent":1427,"scope":"Rare earth (lanthanide series) element with symbol Tb and atomic number 65 <http:\/\/periodic.lanl.gov\/65.shtml>"},{"code":1594,"name":"thulium","parent":1427,"scope":"Rare earth (lanthanide series) element with symbol Tm and atomic number 69 <http:\/\/periodic.lanl.gov\/69.shtml>"},{"code":1616,"name":"ytterbium","parent":1427,"scope":"Rare earth (lanthanide series) element with symbol Yb and atomic number 70 <http:\/\/periodic.lanl.gov\/70.shtml>"}]}