| 单词 | mass number |
| 释义 | mass number in British Englishnoun the total number of neutrons and protons in the nucleus of a particular atom Symbol: A. Also called: nucleon numbermass number in American English Physics and Chemistry the number of neutrons and protons in the nucleus of an atom: the approximate mass of a given nucleus is obtained by multiplying the mass number by the fundamental unit of mass, 1.6605 × 10-24 grams (1⁄12 the mass of C12 atom) |
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