[ peer-ee-od-ik, peer- ]
/ ˈpɪər iˈɒd ɪk, ˌpɪər- /
a system of classification of the elements based on the periodic law.
How Are Newly Discovered Chemical Elements Named?Unlike common elements, newer elements are synthesized in a lab; they are not observed in nature. They are very unstable and quickly dissolve into other elements. So how do scientists name them?
Origin of periodic system
First recorded in 1870–75
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for periodic system
/ (ˌpɪərɪˈɒdɪk) /
the classification of the elements based on the periodic law
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012