Noun:
-
(chemistry) the mass of an atom of a chemical element expressed in atomic mass units
- Atoms of the same element that differ in their atomic weight are called isotopes.
具有不同原子量的同一种元素被称为同位素。
- Electrons weigh very little, so they aren't even counted in the atomic weight.
电子非常轻，因此在原子量中甚至没有计算它。
