mass number
Example Sentences
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As an example, the masses and radii of all nuclei up to mass number 50 were calculated using this method.
From Science Daily • May 15, 2024
Since an element’s isotopes will have slightly different mass numbers, scientists also determine the atomic mass, which is the calculated mean of the mass number for its naturally occurring isotopes.
From Textbooks • Jun. 9, 2022
The iodine atoms are added as anions, and each has a 1− charge and a mass number of 127.
From Textbooks • Feb. 14, 2019
The mass number, or atomic mass, is the number of protons plus the number of neutrons of that element.
From Textbooks • Apr. 25, 2013
This gives off alpha particles at such a rate that half of it has decomposed in 150 days, leaving plutonium with atomic number 94 and mass number 238.
From A Brief History of Element Discovery, Synthesis, and Analysis by Watson, Glen W.
