What is the meaning of atomic number 21?

noun

  • A white trivalent metallic element; sometimes classified in the rare earth group; occurs in the Scandinavian mineral thortveitite.
WordNet 3.0 © 2006 by Princeton University
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APAWordNet. (2010). atomic number 21. Retrieved September 22, 2026, from http://smartdefine.org/atomic_number_21/definitions/1258296
ChicagoWordNet. 2010. "atomic number 21" http://smartdefine.org/atomic_number_21/definitions/1258296 (accessed September 22, 2026).
HarvardWordNet 2010, atomic number 21, Smart Define, viewed 22 September, 2026, <http://smartdefine.org/atomic_number_21/definitions/1258296>.
MLAWordNet. "atomic number 21" 23 October 2010. Web. 22 September 2026. <http://smartdefine.org/atomic_number_21/definitions/1258296>