Read Edit View history 质量数 zhìliàngshù mass number Origin Definitions Defs Strokes Stroke Words Sentences Sents created sense approved 质量数/質量數 · zhìliàngshù · mass number 2026/03/04 质量数 / 質量數 zhìliàngshù mass number the total number of protons and neutrons in an atomic nucleus; atomic weight or mass 在该核反帔中，质量数是守恒的。 created sense Mar 4, 2026, 02:25 AM