What is the meaning of atomic number 18?

noun

  • A colorless and odorless inert gas; one of the six inert gases; comprises approximately 1% of the earth's atmosphere.
WordNet 3.0 © 2006 by Princeton University
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APAWordNet. (2010). atomic number 18. Retrieved September 21, 2026, from http://smartdefine.org/atomic_number_18/definitions/1258292
ChicagoWordNet. 2010. "atomic number 18" http://smartdefine.org/atomic_number_18/definitions/1258292 (accessed September 21, 2026).
HarvardWordNet 2010, atomic number 18, Smart Define, viewed 21 September, 2026, <http://smartdefine.org/atomic_number_18/definitions/1258292>.
MLAWordNet. "atomic number 18" 23 October 2010. Web. 21 September 2026. <http://smartdefine.org/atomic_number_18/definitions/1258292>