What is the meaning of Heptavalent?

(a.) Having seven units of attractive force or affinity; -- said of heptad elements or radicals.
Webster's Revised Unabridged Dictionary
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APAWebster's. (2011). heptavalent. Retrieved September 25, 2026, from http://smartdefine.org/heptavalent/definitions/2016037
ChicagoWebster's. 2011. "heptavalent" http://smartdefine.org/heptavalent/definitions/2016037 (accessed September 25, 2026).
HarvardWebster's 2011, heptavalent, Smart Define, viewed 25 September, 2026, <http://smartdefine.org/heptavalent/definitions/2016037>.
MLAWebster's. "heptavalent" 27 May 2011. Web. 25 September 2026. <http://smartdefine.org/heptavalent/definitions/2016037>