atomic mass

名词 atomic mass:

1. (chemistry) the mass (in atomic mass units) of an isotope of an element

1. Any of two or more kinds of atoms having the same atomic mass but different atomic numbers.
   同量异位素两种或各多种有相同原子质量但却有不同的原子序数的原子中的任一种
2. A type of atom specified by its atomic number, atomic mass, and energy state, such as carbon14.
   核种由它的原子序数、原子量和能量状况具体确定的一种原子，如碳14