英语词汇“mass number”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词	mass number
释义	mass number noun Physics The total number of protons and neutrons in a nucleus.The sum of the protons and neutrons is called the mass number.... Various numbers are used to define nuclei: the atomic number, Z, is the number of protons, while the mass number is the sum of the atomic number and the number of neutrons, N. The mass number gives you the total number of protons and neutrons in the nucleus of that element.
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