query: SELECT ?item ?halfLife ?halfLifeUnitLabel WHERE { {?item wdt:P31 wd:Q878130 .} UNION {?item wdt:P31/wdt:P279* wd:Q25276 ;  p:P2114 ?hl_statement . ?hl_statement psv:P2114 ?hl_value . ?hl_value wikibase:quantityAmount ?halfLife ;  wikibase:quantityUnit ?halfLifeUnit . FILTER NOT EXISTS { ?item wdt:P31 wd:Q846110 . } } SERVICE wikibase:label { bd:serviceParam wikibase:language "en" . } }