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1·Indium, for example, had previously been assigned an atomic mass between those of arsenic and selenium.

例如，人们以前认为铟的原子质量介于砷和硒之间。

2·Just five years later an element with the proper atomic mass was isolated and named gallium by its discoverer.

仅仅5年后，一种具有适当原子质量的元素被分离出来，并被发现者命名为镓。

3·For example, tellurium comes before iodine in the periodic table, even though its atomic mass is slightly greater.

例如在元素周期表中，碲排在碘之前，尽管它的原子质量略大一些。

4·In fact, subsequent work has shown that in a periodic table, elements should not be ordered strictly by atomic mass.

事实上，后来的研究已经证明，在元素周期表中，元素不应该严格按照原子质量来排序。

5·All the isotopes of a given element have the same number of protons, but differ in their number of neutrons, and hence in their atomic mass.

给定元素的所有同位素都含有相同的质子数，但它们的中子数不同，因此它们的原子质量也不同。

6·Mendeleyev was bolder than Meyer and even assumed that if a measured atomic mass put an element in the wrong place in the table, the atomic mass was wrong.

门捷列夫比迈耶更大胆，他甚至认为，如果测量到的原子质量在表中把一个元素对应于错误的位置，这个原子质量就是错误的。

7·And this is called the atomic mass.

这是原子质量。

8·I already showed you the atomic mass.

我已经向你们展示了原子质量了。

9·And he was very proficient at measuring atomic mass.

他对测量原子质量很精通。

10·This is 12.011 grams per mole or 12.011 atomic mass units,AMU.

这是12。011克每摩尔,或者12。011原子质量单位。

原子量

1·The average mass of an atom of an element, usually expressed relative to the mass of carbon 12, which is assigned 12 atomic mass units.

一种元素中原子的平均重量，通常相对碳12的重量来表示，碳12的重量定为十二个原子量单位。