Electron affinity, however, can be either negative or it can be positive.
但是，电子亲和能既可以是负的，也可以是正的。
But it didn't matter under those conditions because an electron could then never jump into one of the states of negative energy.
但它在那些情况下并不成为问题，因为一个电子永远不可能跃迁到任何一个负能态之中。
So most of you recognize, if we switch back to the notes, that they do have a negative electron affinity.
看来大部人都想到了，如果你翻翻讲义的话，它们的电子亲和能确实是负的。
Traditional fuel cells work by using a catalytic material to oxidise a fuel, such as hydrogen, turning it into a positively charged ion and a negative electron.
传统的燃料电池使用催化材料来氧化燃料，比如氢气，使之转变为一个带正电的离子与一个电子。
So while an electron has a negative charge, its antimatter counterpart, a positron, has a positive charge and they annihilate each other when they get too close.
所以，电子带负电，那它对应的反物质正电子就带正电，并且它俩如果靠太近就会湮灭掉。
So for example, that might have a formal charge of negative 1, because to some extent it has gained that much electron density that it now has a formal charge that's negative.
比如，可能它的形式电荷为负一，因为在一定程度上它得到了这么多的共用电子密度，那么它现在就有了负的形式电荷。
It was not long before a new difficulty appeared.Namely, working with this equation, one found that the electron had states of negative energy.
随即一个新问题就被发现了，那就是，在解这个方程的时候，我们会发现电子有负能量的能级。
It was not long before a new difficulty appeared. Namely, working with this equation, one found that the electron had states of negative energy.
随即一个新问题就被发现了，那就是，在解这个方程的时候，我们会发现电子有负能量的能级。
A chemical bond in which one atom loses an electron to form a positive ion and the other atom gains to electron to form a negative ion.
一个原子失掉一个电子来形成一个正离子，另一个原子得到一个电子来形成一个负离子的化学键。
A proton has positive charge and an electron (has) a negative charge, but a neutron has neither.
质子带有一个正电荷，电子带有一个负电荷，但这两种电荷中子都没有。
So, an electron has a charge of negative e, we've written here and the nucleus has a charge of positive e.
我们写在这，原子核带正e的电荷，我们看到作用力。
Each electron bears a single negative charge.
每一个电子都带有一个负电荷。
Between these two tiny particles, the proton and the electron, there is a powerful attraction that is always present between negative and positive electric charges.
在质子和电子这两个微粒之间有一个很大的吸引力，而这个吸引力总是存在于正、负电荷之间。
Unlike either the electron which has a negative charge or the proton which has a positive charge, the neutron has no charge at all.
中子既不象带负电荷的电子，也不象带正电荷的质子，它根本就不带任何电荷。
The main factors governing photoinduced toxicity of the anthraquinone are molecular polarity, the ability of electron transition and the largest negative net atomic charges.
影响蒽醌类化合物对大型溞光敏化毒性的主要因素是分子的极性、电子的跃迁能力和原子最负净电荷。
The nucleation enhancement by the negative biased substrate is believed to be a result of the electron emission and ions bombardment.
研究表明，负衬底偏压增强成核主要是发射电子和离子轰击的结果。
According to the distribution of potential, electron and hole in the BNRT at different stages, the mechanism inducing S-type negative resistance characteristics is explained.
根据BNRT不同工作状态下的内部电势、电子浓度和空穴浓度分布，解释了其S型负阻特性的产生机理。
Under negative staining electron microscopy, the keratin was a filament with a diameter of 80-100A.
用电镜负染技术观察角蛋白细丝并测定其直径为80～100A。
One is negative electricity, being, in fact, the tiny particle called the electron, familiar to radio fans as one of the particles vast swarms of which operate radio vacuum tubes.
其中一种带负电，实际上我们称它为电子，熟悉半导体收音机的爱好者都知道机器里面的电子管中含有大量的这种电子微粒。
By convention, current in a circuit is considered to flow from a more positive point to a more negative point, even though the actual electron flow is in the opposite direction.
按照惯例，电路中的电流被认为是从正端流向负端，上电子足以反方向流动的。
The proton carries a positive charge and the electron carries a negative charge but the neutron carries neither.
质子带正电荷，电子带负电荷，中子两种电荷都不带。
It was found that introducing electron donating groups, such as alkyls, weaken the electron accepting ability of C60 and make its first reduction wave shifted to more negative position.
结果发现，引入推电子基团，如烷基，会使C60得电子能力降低，第一个还原电位有较大的负移；
So do you think noble gases would have a high positive electron affinity, a low positive, or negative electron affinity?
那么，你认为稀有气体的电子亲和能，应该是一个高的正值，一个低的正值，还是一个负值？
A proton has positive charge and an electron has negative charge.
质子带正电荷，电子带负电荷。
Cellotriose and cellotetraose were analyzed by electron pray ionization mass spectrometry(ESI-MS) with negative ion mode.
在负离子模式下对纤维三糖和纤维四糖进行电喷雾电离质谱（ESI-MS）分析。
We have the minus because we're adding a negative charge from the electron.
有这个负号的原因是，我们得到一个电子后增加了一个单位负电荷。
This paper introduces the develpment of low contrast electron microscope image negative and photograph, according to the basic composition of the developing liquid and the action of each composition.
本文根据显影液的各组成成份在显影过程中的作用特点，介绍了低反差电镜图像底片及照片的冲洗方法。
So, what we're looking at here is the force when we have two charged particles, one positive one negative -- here, the nucleus and an electron.
我们现在研究的是，一正一负俩个带电粒子之间的，作用力-在这里。
So this is not going to be a favorable process, we're going to find that the electron affinity is actually a negative 7 kilojoules per mole for nitrogen.
因此这并不是一个容易发生的过程，我们会发现氮的电子亲和能，应该是负的，7，千焦每摩尔。
So this is not going to be a favorable process, we're going to find that the electron affinity is actually a negative 7 kilojoules per mole for nitrogen.
因此这并不是一个容易发生的过程，我们会发现氮的电子亲和能，应该是负的，7，千焦每摩尔。
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