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relative atomic mass

British  

noun

  1.  Ar.  Former name: atomic weight.   r.a.m..  the ratio of the average mass per atom of the naturally occurring form of an element to one-twelfth the mass of an atom of carbon-12

"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
relative atomic mass Scientific  
/ rĕl′ə-tĭv /

  1. See atomic weight

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Thus, in the modern periodic table, the elements are arranged according to their atomic number - not their relative atomic mass.

From BBC

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.