| NOUN | quantity | mass number, nucleon number | the sum of the number of neutrons and protons in an atomic nucleus |
|---|
| Meaning | The sum of the number of neutrons and protons in an atomic nucleus. | |
|---|---|---|
| Synonym | nucleon number | |
| Broader | mass unit | A unit of measurement for mass |
| Catalan | nombre màssic | |
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