Definitions
American Heritage® Dictionary of the English Language, Fourth Edition
- n. The sum of the number of neutrons and protons in an atomic nucleus. Also called nucleon number.
Wiktionary
WordNet 3.0
- n. the sum of the number of neutrons and protons in an atomic nucleus
Examples
“Nitrogen is the commonest gas in the atmosphere and its mass number is 14, the same as carbon-14’s.”
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