This means you can vary the neutron number without changing chemical identity, because chemical identity is fixed by the proton.

这表示你可以改变中子数,而不会改变它的化学特性，因为化学特性是由质子决定的。

麻省理工公开课 - 固态化学导论课程节选

Isotopes have the same chemical identity but different nuclear properties.

同位素有相同的化学特性,但是原子属性不同。

麻省理工公开课 - 固态化学导论课程节选

Now that's pretty far fetched and not many people would say that a pop tart should be a controlled substance and regulated by government, but there are some very interesting chemical properties associated with foods like this that trigger things going on in the brain that affect us in a very big way.

这多少有点牵强,而且也没有很多人会认为,这种果酱馅饼应归为管制品,并受到政府监管,但有趣的是这种食品,确实有一些特别的化学特性,它会作用于大脑并会对我们产生大的影响

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

Atoms of different elements have different weights and different chemical properties.

不同元素的原子的质量不同,化学特性也不相同。

麻省理工公开课 - 固态化学导论课程节选