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Mass number
01
质量数, 原子质量数
the total number of protons and neutrons in the nucleus of an atom
Example
The mass number of carbon-12 is 12, as it has 6 protons and 6 neutrons.
碳-12的质量数是12，因为它有6个质子和6个中子。
Uranium-238 has a mass number of 238, indicating it has 92 protons and 146 neutrons.
铀-238的质量数为238，表明它有92个质子和146个中子。
