数世纪以来，许多人都对金星着迷，因为它有厚厚的云层覆盖——一颗所谓的神秘星球。

Many people have been fascinated about Venus for centuries because of its thick cloud cover—a so-called planet of mystery and all of that.

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He has two electrons here with the same set of quantum numbers. B but these are two separate hydrogen atoms.

因为我写了两个量子数,一样的电子,但这是在两个不同原子中啊。

麻省理工公开课 - 固态化学导论课程节选

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

So, what we can do instead of talking about the ionization energy, z because that's one of our known quantities, so that we can find z effective.

我们做的事可以代替讨论电离能,因为那是我们知道的量子数之一，那是我们可以解出有效的，如果我们重新排列这个方程。

麻省理工公开课 - 化学原理课程节选