Definition of atomic number 18
English to English noun - a colorless and odorless inert gas; one of the six inert gases; comprises approximately 1% of the earth's atmosphere
source: WordNet 3.0
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atomic number 18, atomic number 108, atomic number 8, atomic number 1, atomic number 85, atomic number 61, atomic number 12, atomic number 71, atomic number 21, atomic number 28, atomic number 89, atomic number 16, atomic number 80, atomic number 86, atomic number 88, atomic number 10, atomic number 98, atomic number 11, atomic number 84, atomic number 15
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