{"thcode":2,"term":{"code":1426,"name":"chemical element groups","parent":1382,"scope":"Groups shown at <http:\/\/periodic.lanl.gov\/>"},"uf":[],"bt":[{"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":[{"code":1384,"name":"actinide series elements","parent":1426,"scope":null},{"code":1388,"name":"alkali metal elements","parent":1426,"scope":null},{"code":1389,"name":"alkaline earth elements","parent":1426,"scope":null},{"code":1467,"name":"halogen elements","parent":1426,"scope":null},{"code":1489,"name":"lanthanide series elements","parent":1426,"scope":null},{"code":1504,"name":"metal elements","parent":1426,"scope":null},{"code":1525,"name":"noble gas elements","parent":1426,"scope":null},{"code":1526,"name":"nonmetal elements","parent":1426,"scope":null},{"code":2263,"name":"platinum-group elements","parent":1426,"scope":"A group of chemically similar metal elements that tend to occur in the same types of mineral deposits."},{"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."}],"rt":[]}