Question: What is the chemical element with the greatest electronegativity whose subject role is a trace element?
Paraphrase: What chemical element with the subject role of a trace element has the greatest electronegativity?
SPARQL (Wikidata): select ?ent where { ?ent wdt:P31 wd:Q11344 . ?ent wdt:P1108 ?obj . ?ent wdt:P2868 wd:Q50430179 } ORDER BY DESC(?obj)LIMIT 5