What is the meaning of atomic number 87?

noun

  • A radioactive element of the alkali-metal group discovered as a disintegration product of actinium.
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APAWordNet. (2010). atomic number 87. Retrieved September 20, 2026, from http://smartdefine.org/atomic_number_87/definitions/1258366
ChicagoWordNet. 2010. "atomic number 87" http://smartdefine.org/atomic_number_87/definitions/1258366 (accessed September 20, 2026).
HarvardWordNet 2010, atomic number 87, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/atomic_number_87/definitions/1258366>.
MLAWordNet. "atomic number 87" 23 October 2010. Web. 20 September 2026. <http://smartdefine.org/atomic_number_87/definitions/1258366>