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。
If the atom is fixed mass, the electron is tiny, It must be the positives have all the mass.
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。
I mean they take up a teeny bit but essentially when we're thinking about the set up of the atom, we don't have to account for them as using up a lot of the mass we're discussing.
所以我们可以假设电子没有质量,它们占据了,非常小的一部分,所以当我们考虑,原子的构造的时候,不用考虑它们的质量。
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。
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。
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。
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。
Further, the nucleus is assumed to be the seat of the essential part of the mass of the atom, and to have linear dimensions exceedingly small compared with the linear dimensions of the whole atom."
进一步的,核被认为是,原子主要质量所在的地方,和整个原子线性尺度相比,核具有很好的线性尺度“
The number of electrons in an atom is deduced to be approximately equal to half the atomic weight.
原子中的电子数,将近是原子质量的一般。
And he found that the middle member of the triad had an atomic mass that was midway between the atomic masses of the end members.
他发现三元组中间的元素,的原子质量,是位于两端的元素的原子质量,的中间。
Furthermore, the electron has a very tiny mass in comparison to that of the overall atom.
进一步,电子的质量很小,相比于整个原子。
If you add all these up then you end up 011 with 12.011 as the atomic mass.
如果你将这些都加起来,你会得出,原子质量是12。
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。
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?
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。
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。
This is where most of the mass resides and the positive charge resides.
原子的质量和正电荷,大都集中在这里。
And so you can look, for example, at the Periodic Table And, if you look up the atomic mass of carbon, 011 you will see that carbon comes at 12.011 for carbon.
如你们所见,例如,在周期表中,如果你观察碳的原子质量,你会看到是12。
And this is called the atomic mass.
这是原子质量。
Atoms of different elements have different weights and different chemical properties.
不同元素的原子的质量不同,化学特性也不相同。
And he was very proficient at measuring atomic mass.
他对测量原子质量很精通。
8 He predicted 68 for the atomic mass.
他预测它的原子质量是。
I already showed you the atomic mass.
我已经向你们展示了原子质量了。
应用推荐