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Answer for the clue "Element 118, which has the highest atomic mass of all discovered elements ", 10 letters:
ununoctium

Word definitions for ununoctium in dictionaries

Wikipedia Word definitions in Wikipedia
Ununoctium ( symbol Uuo ) is the temporary name of a transactinide chemical element . It was first synthesized in 2002 by a joint team of Russian and American scientists at the Joint Institute for Nuclear Research (JINR) in Dubna , Russia. With the atomic ...

Wiktionary Word definitions in Wiktionary
n. The systematic element name for the chemical element with atomic number 118 (''symbol'' Uuo).