what is the {series ordinal} for {osmium tetroxide} has {ionization energy} as {12.6} ?
The ionization energy of 12.6 belongs to which series ordinal of osmium tetroxide?
which series ordinal of osmium tetroxide has ionization energy of 12.6?
SELECT ?t WHERE { resource:osmium_tetroxide property:ionization_energy ?w . ?w property:ionization_energy ?k . FILTER ( ?k = 12.6 ) . ?w property:series_ordinal ?t }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q422021> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P2260> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <12.6> .
?statement <http://www.wikidata.org/entity/P1545> ?value. 
} 

SELECT ?value WHERE { wd:Q422021 p:P2260 ?s . ?s ps:P2260 ?x filter(contains(?x , '12.6')) . ?s pq:P1545 ?value}