例如，人们以前认为铟的原子质量介于砷和硒之间。
Indium, for example, had previously been assigned an atomic mass between those of arsenic and selenium.
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。
For example, tellurium comes before iodine in the periodic table, even though its atomic mass is slightly greater.
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。
Just five years later an element with the proper atomic mass was isolated and named gallium by its discoverer.
如果是原子质量一定，而电子很小，那么带正电荷的部分几乎占据了全部质量。
If the atom is fixed mass, and the electron is tiny, it must be the positives have all the 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。
In fact, subsequent work has shown that in a periodic table, elements should not be ordered strictly by 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。
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.
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。
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.
我已经向你们展示了原子质量了。
他对测量原子质量很精通。
原子中的电子数,将近是原子质量的一般。
The number of electrons in an atom is deduced to be approximately equal to half the atomic weight.
我会在深入，还会预测它的原子质量是多少。
And I will go even further and will predict what its atomic mass is.
这是原子质量。
原子质量数大于1的氢的同位素；氘或氚。
An isotope of hydrogen with mass number greater than 1; deuterium or tritium.
电子的质量是氢原子质量的1850分之一。
锕铀铀的同位素，原子质量数为235，与慢。
The isotope of uranium with mass number235, fissionable with slow neutrons.
这是12。011克每摩尔,或者12。011原子质量单位。
This is 12.011 grams per mole or 12.011 atomic mass units,AMU.
的数量最丰富的一种同位素，h1，原子质量为1。
The most abundant isotope of hydrogen, H1, with atomic mass1.
我想你一定知道原子质量中负荷的不可思议的巨大能量。
I guess you know about the fantastic charge of energy packed in the mass of the atom.
原子质量的精确值是用一种称为质谱仪的装置来测量的。
Precision values of atomic masses are measured in a device called a mass spectroscope.
元素相对原子质量与它的比热容的乘积，大约为6.4。
The product of a solid element's relative atomic mass and its specific heat capacity is approximately 6.4.
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。
It is a double column, You can see, it starts with hydrogen and goes to mercury in ascending order of atomic mass.
进一步的研究揭示出：部分原子质量常是同位素的混合物。
Extensive research has shown that fractional atomic masses always mean mixture of isotopes.
如果是原子质量一定，电子很小，带正电荷的部分几乎占据了全部质量。
If the atom is fixed mass, the electron is tiny, it must be the positives have all the mass.
那么质量守恒是什么呢？，如果我们在这儿按原子质量划分？
So, what's the conservation of mass if we divide by the atomic masses here?
你可以看到原子质量单位就是，不好意思，我们换个方式说。
You can see the atomic mass unit will be, excuse me. Let me go at it a different way.
在分析测定镁相对原子质量的原装置不足的基础上，提出了改进办法。
On the basis of fully analyzing the deficiencies of the old apparatus, the paper gives a practical way to improve it.
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。
The elements, if arranged according to their atomic mass, exhibit an evident periodicity of properties.
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。
In the first class, we reviewed last class 'content which were relative atomic mass and relative formula 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。
That is why this says atomic number, but for most intents and purposes we can say this could be atomic mass.
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。
A dictionary that contains information such as atomic mass, weight, date of discovery etc. about all elements.
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