英语释义

• (chemistry) a property of atoms or radicals; their combining power given in terms of the number of hydrogen atoms (or the equivalent)

• (biology) a relative capacity to unite or react or interact as with antigens or a biological substrate

片语

valence electron[物化] 价电子

valence shell价电子层

Valence Grammar结合价语法

cationic valence阳离子价数

valence band[物化] 价带

Valence Theory结合价理论

partial valence余价

valence bond[物化] 价键

valence state[物化] 价态

null valence零价

valence force原子价力

英汉例句

• for our step two, what we need is number of valence electrons.

  我们的第二步，需要知道价电子的个数。

• when an electron leaps into the conduction band, it leaves behind a hole in the valence band.

  当一个电子跃迁到传导带，它会在价带留下一个「凹陷」。

• so, now with this framework, i said that talking about these valence electrons might give us some insight into chemical reactivity.

  所以，现在对于这个结构，我认为讨论价电子能,会让我们对化学反应有更深的领悟。

• how many electrons do we need to have full valence shells?

  要把价层排满需要多少个电子？

• however, unlike the semiconductor silicon, graphene has no gap between its valence and conduction bands.

  然而，与半导体硅不同，石墨烯的价带和导带之间没有带隙。

• this hardness or softness of the valence electron set correlates well with the physical properties of the gases.

  这一价电子系列的软硬程度和稀有气体的物理性质很有关系。

• co right, so you take the co here, and we take the valence here, and out of that comes covalent.

  好了，然后我们看到，我们可以看到他的化合价，他们成共价键。

• then it says, count all the valence electrons.

  然后它说，考虑所有的价电子。

• so we actually only need two electrons to fill up the valence shell of hydrogen, remember that「s because all we need to fill up is the 1 s.

  我们其实只需要两个电子,就可以将氢的价壳层排满，要记得这是因为我们只需要排满，1，s，轨道。

• step three in our lewis structure rules is to figure out how many electrons we would need in order for every single atom in our molecule to have a full valence shell.

  路易斯结构规则的第三步是,找出让分子中每个原子的价壳层,都排满应该需要多少个价电子。

• and remember, we」re only talking about valence electrons, so the outer-most shells.

  要记得，我们讨论的只是价电子，也就是最外层的电子。

• now here is fluorine, same skeleton, only fluorine has seven valence electrons.

  这是氟，同样的结构，只有氟有七个价电子。

• so the idea behind valence bond theory is very easy to understand.

  价电子成键理论,非常容易理解。

• if you want to understand whether compounds form or not look only at the valence shell.

  如果你想理解化合物是否形成,而不仅仅只是看看价层。

• and, at the other extreme, we have elements with very high value, elements with high average valence electron energy.

  另外，在另一端，我们有原子序数较大的元素，这些元素有着较高的平均化合价和电子能。

• and, it says, ok, center the element with the lowest average valence electron energy.

  它说，好的,把具有最低平均价电子能的元素画在中心。

• how many valence electrons do we have left?

  我们还剩下多少个价电子？

• in an indirect-band-gap material like germanium, the momentum of the lowest-energy state is misaligned with that of the valence band (yellow and black arrows).

  在一个间接带隙材料，像锗元素，最低能级与价带（绿色）的动量差不同（参见黄色和黑色的箭头）。

• so let「s think about methane using valence bond theory.

  让我们用价电子成键理论来看一看甲烷。

• in valence bond theory, the focus is on discussing the bonds, but it should look very familiar to you, because there」s two types of bonds that we want to discuss here.

  在价电子成键理论中，所关注的是讨论成键，但这对于你们来说应该很熟悉，因为这是我们要讨论的两种键。

• our next step is thinking about valence electrons.

  我们下一步要考虑的是价电子。

• and to do this we「re going to introduce valence bond theory, and the idea of hybridization of orbitals.

  在这之前我们要引入价电子成键理论，和杂化轨道的概念。

• in other words, if the average energy of all the valence electrons.

  换句话说，就是所有价电子的平均能量。

• it means cooperative sharing of valence electrons.

  这意味着价电子的合作共享。

• so we have seven valence electrons.

  我们有七个价电子。

• and, all he」s done is leave the valence electrons associated.

  他所做的全部是,考虑到了价电子的关系。

• so, using our simple valence bond theory, what we would expect is that we want to pair up any unpaired electrons in methane with unpaired electrons from hydrogen and form bonds.

  利用简单的价电子成键理论，我们预计,要把所有甲烷中没有配对的电子,和氢原子中没有配对的电子配对来形成键。

• these have low average valence electron energies.

  他们有较低的平均价电子能。

• ok, elements with low average valence electron energy, and here i'm saying below 11 electron volts, these are good electron donors.

  平均价电子能都较低的元素，我是指那些低于11电子伏的，这些是很好的电子给体。