Question: WHICH IS THE ISOLTOPE OF THALLIUM WITH TH MOST ATOMIC NUMBER
Paraphrase: Which Thallium has highest atom number?
SPARQL (Wikidata): select ?ent where { ?ent wdt:P31 wd:Q28223 . ?ent wdt:P1086 ?obj } ORDER BY DESC(?obj)LIMIT 5 
Answer: thallium-176, thallium-177, thallium-177m, thallium-178, thallium-179