the total number of protons and neutrons in an atomic nucleus.
| 单词 | θ79789 |
| 释义 | the world > matter > physics > atomic nucleus > [noun] > sum of protons and neutrons in mass (3) mass number1923 the total number of protons and neutrons in an atomic nucleus. Subcategories:— less mass of nucleus (1) — fraction (1) |
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