| element 112 n. An artificially produced radioactive element with atomic number 112 whose isotope has a mass number of 277 and a half-life of 280 milliseconds. Also called ununbium. |
| element 112
Symbol Uub An artificially produced radioactive element whose isotope has a mass number of 277 and a half-life of 280 milliseconds. Atomic number 112. Also called ununbium. See Periodic Table. |