1. argonon

noun. Any of the chemically inert gaseous elements of the helium group in the periodic table.
Synonyms
atomic number 36 Kr krypton He radon gas xenon Ne atomic number 54 inert gas atomic number 18 Ar argon atomic number 10 noble gas helium atomic number 86 chemical element Rn Xe element neon atomic number 2
Antonyms
understate unleaded gasoline leaded gasoline defend software
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