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n. Symbol Cn
An artificially produced radioactive element with atomic number 112 that has only been produced in trace amounts and has nine observed isotopes with mass numbers ranging from 277 to 285. The most stable isotope has a mass number of 285 and a half-life of about 34 seconds.
[After Nicolaus Copernicus.]
(Elements & Compounds) a highly radioactive element that is produced synthetically. Symbol: Cn; atomic no: 112; atomic wt: 285
[C21: named after Nicolaus Copernicus ]