query: SELECT ?item ?itemLabel ?atomnumber ?val ?unit ?unitLabel
  { 
    ?item wdt:P31 wd:Q11344 ;
          wdt:P1086 ?atomnumber ;
          p:P2067 ?stmt .
    ?stmt psv:P2067 ?val .
    ?val wikibase:quantityUnit ?unit .
    
    SERVICE wikibase:label {
       bd:serviceParam wikibase:language "en" .}
  } ORDER BY ?atomnumber