ununseptium Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition Temporary symbolUus; atomic number117; superheavy artificial chemical element; this is a temporary systematic element name Example Sentence Ununseptium is an element with the temporary symbol Uus and atomic number 117. Synonyms element 117; Uus; Atomic number 117 Antonyms gold Hear It! Say It! Write It! ununseptium Switch to cursive Start Share with your friends: