query: SELECT ?item ?label ?life_in_s ?abundance WHERE {
    ?eleiso wdt:P279* wd:Q25276 .
    ?item wdt:P31 ?eleiso.
    SERVICE wikibase:label {
      bd:serviceParam wikibase:language "en" . 
      ?item rdfs:label ?label
    }
    ?item p:P2114 ?stmnode .  
    
    ?stmnode       psv:P2114                   ?valuenode.
    ?valuenode     wikibase:quantityAmount     ?life.
    ?valuenode     wikibase:quantityUnit       ?unit.
    # conversion to SI unit
    ?unit          p:P2370                 ?unitstmnode.   # conversion to SI unit
    ?unitstmnode   psv:P2370               ?unitvaluenode. 
    ?unitvaluenode wikibase:quantityAmount ?conversion.
    ?unitvaluenode wikibase:quantityUnit   wd:Q11574.      # second
    BIND(?life * ?conversion AS ?life_in_s).
  
    OPTIONAL{?item wdt:P2374 ?abundance .}
  }
  LIMIT 10000