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原子量是某元素原子的平均质量与某一“标准”的比值。从1961年开始，将～个核素碳．12原子质量的1／12定为原子量的标准单位。碳的原子量为12．0107（8）（1995年值），这是一个平均值，它反映了碳核素的典型天然丰度比。由于大多数化学反应都是按原子间简单数目关系进行，而
The atomic weight is the ratio of the average mass of a certain elemental atom to a certain “standard”. From 1961 onwards, a nuclear carbon. 1/12 of the atomic mass is set as the standard unit of atomic weight. The atomic weight of carbon is 12.0107 (8) (1995 value), which is an average value that reflects the typical natural abundance ratio of carbon nuclides. Because most of the chemical reactions are based on a simple atomic number between the relationship, and