element 111

element 111

Symbol Uuu

An artificially produced radioactive element whose isotope has a mass number of 272 and a half-life of 1.5 milliseconds. Atomic number 111. Also called unununium. See Periodic Table.

Thesaurus

Noun

1.

element 111 - a radioactive transuranic element atomic number 111, Rg, roentgenium chemical element, element - any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter