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。
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。
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。
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。
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。
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。
I already showed you the atomic mass.
我已经向你们展示了原子质量了。
And I will go even further and will predict what its atomic mass is.
我会在深入，还会预测它的原子质量是多少。
And he was very proficient at measuring atomic mass.
他对测量原子质量很精通。
It is a double column, You can see, it starts with hydrogen and goes to mercury in ascending order of atomic mass.
双纵栏，你们看到，从氢开始，然后到水银，按原子质量的升序排列。
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。
And this is called the atomic mass.
这是原子质量。
We have a table of the elements with properties varying periodically with atomic mass, so we compress all of that information and refer to it as the Periodic Table.
我们有一个元素表，其中的元素的特性，随着原子质量的改变而引起周期性的变化，所以我们将所有的信息精简，将它变成一个周期表。
So, what's the conservation of mass if we divide by the atomic masses here?
那么质量守恒是什么呢？，如果我们在这儿按原子质量划分？
An experiment was conducted to study the high-temperature annealing characteristics of polysilicon films using atomic force microscope, secondary ion mass spectroscopy and probe.
利用原子力显微镜、二次离子质谱分析仪和探针，对多晶硅薄膜的高温退火特性进行了实验研究。
That is why this says atomic number, but for most intents and purposes we can say this could be atomic mass.
那就是为什么这里说原子序数，但如果没有意图和目的，我们就说是原子质量。
I mean, the atom has a tiny mass, too, but what we are saying is compared to the totaled atomic mass, the mass of the electron is tiny.
我的意思是，原子的质量也很小，但是我们说的是，和整个原子质量相比，电子的质量是很小的。
In the first class, we reviewed last class 'content which were relative atomic mass and relative formula mass.
第一节课首先回顾了一下相对原子质量，相对分子质量的定义及计算方法。
You can see the atomic mass unit will be, excuse me. Let me go at it a different way.
你可以看到原子质量单位就是，不好意思，我们换个方式说。
The product of a solid element's relative atomic mass and its specific heat capacity is approximately 6.4.
元素相对原子质量与它的比热容的乘积，大约为6.4。
The elements, if arranged according to their atomic mass, exhibit an evident periodicity of properties.
元素，如果按照他们的原子质量来安排，则它展示了一个明显的周期特性。
A radioactive process in which an atomic nucleus loses energy by emitting a gamma ray without a change in its atomic or mass Numbers.
原子核的一种放射性过程，在这种过程中由于放出一个伽马射线而损失能量，但并不改变原子序数或质量。
A dictionary that contains information such as atomic mass, weight, date of discovery etc. about all elements.
一本关于化学的字典。包含信息譬如原子质量、重量，发现日期等关于所有元素的字典。
Precision values of atomic masses are measured in a device called a mass spectroscope.
原子质量的精确值是用一种称为质谱仪的装置来测量的。
The experimental results showed that the mass loss of atomic oxygen effects is in proportion to the irradiation time.
试验结果表明，原子氧对材料的剥蚀量与原子氧的作用时间成正比例关系。
"Radioisotopes" refer to a certain type of elements producing radiation decay that have the same atomic number but different mass of nuclides.
放射性同位素，是指某种发生放射性衰变的元素中具有相同原子序数但质量不同的核素。
A naturally radioactive carbon isotope with atomic mass 4 and half-life 5,780 years, used in determining the age of ancient organic, geologic, or archaeological specimens.
一种碳的天然放射性同位素，原子量为4，半衰期为5，780年，用于测定古代生物标本，地质标本或考古遗迹的标本的年代。
Mendeleev is the one who taught us that the properties of the elements are a function of the atomic mass.
门捷列夫教授我们元素特性，是元素质量所起的功能。
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。
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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