一种元素的原子序数是其原子核中的质子数。

An element's atomic number is the number of protons in its nucleus.

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早期版本的一些元素原子序数不正确。

Early versions had the incorrect atomic number for some elements.

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早期的版本并没有为每个原子序数列出一个元素。

Early versions did not list an element for every atomic number.

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And, at the other extreme, we have elements with very high value, elements with high average valence electron energy.

另外，在另一端，我们有原子序数较大的元素，这些元素有着较高的平均化合价和电子能。

麻省理工公开课 - 固态化学导论课程节选

So, how many distinct, so again, we're talking about distinct kinetic energies, a spectrum for the element hafnium, 72 and I'll tell you here that it has a z of 72, so you don't have to spend two minutes searching your periodic table.

好，有多少分立的……还是一样，我们讨论的还是不同的动能，铪元素的光谱中出现，而且我来告诉大家铪的原子序数是，这样你就不用因为在元素周期表中找它,而花费两分钟的时间了。

麻省理工公开课 - 化学原理课程节选