Tell me which diatomic nonmetal oxidises fastest?
select ?ent where { ?ent wdt:P31 wd:Q19753344 . ?ent wdt:P1121 ?obj . ?ent wdt:P31 wd:Q19753344 } ORDER BY DESC(?obj)LIMIT 5 
diatomic nonmetal: Q19753344 diatomic nonmetal: Q19753344