mass number

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noun Physics.

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

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On the farm, the feed for chicks is significantly different from the roosters’; ______ not even comparable.

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Origin of mass number

First recorded in 1920–25

Words nearby mass number

mass meeting, mass merchandiser, mass movement, mass murder, mass noun, mass number, mass observation, Masson disk, Massorete, massotherapy, mass peristalsis

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

How to use mass number in a sentence

Now, people are voting in mass numbers to vote the current president out of office.
High Anxiety|Truthbetold|November 4, 2020|TruthBeTold.news
People were going out to vote in mass numbers to vote Barack in office.
High Anxiety|Truthbetold|November 4, 2020|TruthBeTold.news
“Our members continue to face a number of challenges,” she said.
The Republican War on Kale|Patricia Murphy|January 7, 2015|DAILY BEAST
The number of dissenters though is unprecedented in the modern era.
Democrats Accidentally Save Boehner From Republican Coup|Ben Jacobs, Jackie Kucinich|January 6, 2015|DAILY BEAST

Their bodies were later found incinerated and buried in mass graves outside of town.
Why Mexicans Are Enraged by Obama’s Big Tuesday Meeting|Ruben Navarrette Jr.|January 6, 2015|DAILY BEAST
Beyond the huge American flag that hung over the street, the mile-long mass of cops ended.
Funeral Protest Is Too Much for NYPD Union Boss|Michael Daly|January 5, 2015|DAILY BEAST
Starting under Theodore Roosevelt and Howard Taft, embassies headed by career diplomats increased in number.
U.S. Embassies Have Always Been for Sale|William O’Connor|January 2, 2015|DAILY BEAST
The country is well inhabited, for it contains fifty-one cities, near a hundred walled towns, and a great number of villages.
Gulliver's Travels|Jonathan Swift
Charred beams and blackened walls showed stark and gaunt in the glow of a smoldering mass of wreckage.
The Red Year|Louis Tracy
We had six field-pieces, but we only took four, harnessed wit twice the usual number of horses.
Blackwood's Edinburgh Magazine, No. CCCXXXIX. January, 1844. Vol. LV.|Various
There are a number of bacilli, called acid-fast bacilli, which stain in the same way as the tubercle bacillus.
A Manual of Clinical Diagnosis|James Campbell Todd
Five of the number had studied with Liszt before, and the young men are artists already before the public.
Music-Study in Germany|Amy Fay

British Dictionary definitions for mass number

mass number

noun

the total number of neutrons and protons in the nucleus of a particular atomSymbol: 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

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.

mass number

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Origin of mass number

Words nearby mass number

Words related to mass number

How to use mass number in a sentence

British Dictionary definitions for mass number

Scientific definitions for mass number