原子数或原子数目（ Atom number 或 Number of atoms ），非原子序数 (Atomic number)，为某元素于非单原子状态（分子或化合物）时的数目，在化学式中写在元素符号的右下方（下标）。
双语例句原声例句
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各溜分可以由碳氢化合物的碳原子数确定其特征。
The various distillates can be roughly characterized by the number of carbon atoms in their constituent hydrocarbons.
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改变元素需要改变原子数(质子数)。
Changing the element requires changing the atomic (proton) number.
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具备6个质子和6个中子，碳原子数通常为12。
With six protons and six neutrons, carbon normally has an atomic number of 12.
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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。
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He saw that if you take the atomic mass of chlorine, 2 add it to the atomic mass of iodine, divide by two, you get something that is really close to the atomic mass of bromine.
他看到，如果你将氯的原子质量，加上碘的原子质量，除以，得到的数将与,溴的原子质量很接近。
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So similarly, as we now move up only one more atom in the table, 3 so to an atomic number of three or lithium, now we're going from six variables all the way to nine variables.
类似地就像我们现在,移动到周期表中仅仅多一个电子的情况，移动到一个原子数为，或者锂元素,现在我们从6个变量到了9个变量。
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