PREFIX table: <http://www.daml.org/2003/01/periodictable/PeriodicTable#>
PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>

SELECT ?element ?name
WHERE {
  ?element table:group ?group .
  ?group table:name "Noble gas"^^xsd:string .
  ?element table:name ?name .
}