How many {oxidation state} are for {silicon} ?
When does Silicon enter it's oxidation state?
What is the oxidation state for Silicon?
SELECT ( COUNT ( ?b ) AS ?k ) { resource:silicon property:oxidation_state ?b }
SELECT (COUNT(?obj) AS ?objs ) {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q670> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P1121> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj .
} 

SELECT (COUNT(?obj) AS ?value ) { wd:Q670 wdt:P1121 ?obj }
8