- the total number of neutrons and protons in the nucleus of a particular atom
| 单词 | mass number |
| 释义 | WordReference Random House Learner's Dictionary of American English © 2024 ˈmass ˌnum•ber, n. [countable] WordReference Random House Unabridged Dictionary of American English © 2024
mass′ num′ber, [Physics.]
Collins Concise English Dictionary © HarperCollins Publishers:: mass number n
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