What is the {isotope of neutronium} with the {MIN(mean lifetime)} whose {subclass of} is {neutronium}  ?
What is the isotope of neutronium with the lowest average lifetime that is a subclass of neutronium?
select ?ent where { ?ent wdt:P31 wd:Q12525553 . ?ent wdt:P2645 ?obj . ?ent wdt:P279 wd:Q1195471} ORDER BY ASC(?obj)LIMIT 5 
select ?ent where {
?ent <http://www.wikidata.org/entity/P31> <http://wikidata.dbpedia.org/resource/Q12525553>.

?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> ?ent .
?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P2645>.
?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj1.

?statement2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> ?ent .
?statement2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P279> .
?statement2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q1195471> .

}
ORDER BY ASC(?obj1)
LIMIT 5
What isotope and subclass of neutronium has the lowest average lifetime?