copernicium
Americannoun
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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.
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See Periodic Table
Etymology
Origin of copernicium
First recorded in 1005–10; named after Polish astronomer Nicolaus Copernicus.
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Group 12 contains the four elements zinc, cadmium, mercury, and copernicium.
From Textbooks ● Feb. 14, 2019
There are a few of those this time around: copernicium among them.
From Seattle Times ● Aug. 13, 2012
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
