mass number
the integer nearest in value to the atomic weight of an atom and equal to the number of nucleons in the nucleus of the atom. Symbol: A
Compare Meanings
Click for a side-by-side comparison of meanings. Use the word comparison feature to learn the differences between similar and commonly confused words.
Origin of mass number
1Words Nearby mass number
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024
How to use mass number in a sentence
People were going out to vote in mass numbers to vote Barack in office.
Now, people are voting in mass numbers to vote the current president out of office.
There, you can donate to the cause and join the “mass number of Manson supporters worldwide.”
In the black peaty mass number 5, fragments of wood of the oak, yew, and fir have been recognised.
The Geological Evidence of The Antiquity of Man | Charles Lyell
British Dictionary definitions for mass number
the total number of neutrons and protons in the nucleus of a particular atom: Symbol: A Also called: nucleon number
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
Scientific definitions for mass number
The total number of protons and neutrons in the nucleus of an atom. For example, nitrogen has 7 protons and 7 neutrons in its nucleus, giving it a mass number of 14. Isotopes of elements are distinguished by their mass number; for example, carbon-12 and carbon-14 have mass numbers of 12 and 14 respectively. Also called nucleon number Compare atomic mass atomic weight.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Browse