copernicium

American  

[koh-per-nis-ee-uhm] / ˌkoʊ pərˈnɪs i əm /

noun

Chemistry, Physics.

1. a superheavy, synthetic, radioactive element with a very short half-life. Cn; 112.

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copernicium Scientific  

/ kō′pər-nē′sē-əm /

1. Symbol Cn A synthetic radioactive element that has only been produced in trace amounts. The most stable isotope has a mass number of 285 and a half-life of about 34 seconds. Atomic number 112.

2. See Periodic Table

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Etymology

Origin of copernicium

First recorded in 1005–10; named after Polish astronomer Nicolaus Copernicus.