V2EX mass number

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Mass Number

释义 Definition

质量数：原子核中质子数 + 中子数的总和，常用符号 A 表示。用于区分同一元素的不同同位素。（不同于 atomic number 原子序数 Z）

发音 Pronunciation (IPA)

/ms nmbr/

例句 Examples

The mass number of carbon-14 is 14.
碳-14 的质量数是 14。

By comparing mass number and atomic number, we can determine how many neutrons an isotope has.
通过比较质量数和原子序数，我们可以确定某种同位素含有多少个中子。

词源 Etymology

由 mass（质量）+ number（数字）组成的科学术语，用来表示与原子核“质量贡献”最直接相关的计数：核内粒子（核子，即质子和中子）的总数。该概念在近代原子核与同位素研究发展后被广泛使用。

相关词 Related Words

文学与经典作品 Literary Works

Chemistry: The Central Science（多版大学化学教材中常用于讲解同位素与核符号表示）
Atkins’ Physical Chemistry（涉及核结构与相关基础概念时出现）
The Feynman Lectures on Physics（在原子与核的讨论中会使用或对比相关概念）
Introduction to Nuclear Physics（核物理入门教材中高频出现，用于核素与同位素分析）

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