1、Atoms of the same element that differ in their atomic weight are called isotopes.
具有不同原子量的同一種元素被稱為同位素。

2、Molecular weight: Mass of a molecule of a substance, Based on 12 as the atomic weight of carbon-12.
分子量：物質(zhì)的分子質(zhì)量，依據(jù)的事實是1莫耳的碳-12的質(zhì)量是12克。

3、An arrangement of 56 elements in order of ascending atomic weight made by Newlands in 1863.
1863年，紐蘭茨所作。他將56種元素按原子量上升次序排列。

atomic weight翻譯