superheavy


su·per·heav·y

S5955475 (so͞o′pər-hĕv′ē) adj. Having an atomic number higher than found in natural chemical elements (typically 104 and higher). Superheavy elements are radioactive and unstable, having extremely short half-lives.

superheavy

(ˌsuːpəˈhɛvɪ) adj (General Physics) physics denoting or relating to elements of high atomic number (above 109) postulated to exist with special stability as a consequence of the shell model of the nucleus