Mass number
01
质量数, 核子数
the total number of protons and neutrons in the nucleus of an atom
例子
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。
