-
But Yemeni economists say that energy revenue alone will not help average people.
VOA: standard.2010.04.20
-
If I want to take the average energy of all of those, what I can do is go over to my data set.
如果我想得到这所有电子能的平均值，我就得去看一下我的数据库。
-
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。
-
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 you would find that the bond energy of the heteronuclear molecule was nowhere on the average of the two.
你将发现,电子相同的分子的总能量,并不是平分的。
-
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。
-
Its average valence electron energy is 5.2 electron volts, which is a heck of a lot less than 11.
它的平均价电子能是,5。2电子伏，那比11电子伏要少得多。
-
Over here in the lower left corner, we have elements that as a group have very low values of average valence electron energy.
在底层的左侧角落，我们看到以组为单位的,价电子能较低的元素。
-
And we do so by a quantity called the average valence electron energy.
我们可以通过,一个叫做平均价电子能的量来解决这一问题。
-
So then, I could say that the average valence electron energy for oxygen would then be, I've got two s electrons.
所以，我可以说,氧的平均价电子能,就是，以我得到的两个s轨道的电子来算。
-
It's got an average valence electron energy of about 16 eV, 16.5 eV, which is a lot greater than 11.
它的平均价电子能,大约是16eV，16。5eV，那比11要多很多。
-
Just to refresh our memories, we looked at the average valence electron energy as a measure of reactivity.
重新回顾一下我们记忆，我们看了平均价电子能,能用来测量反应性。
-
If you take a look at the last day, or the day before, you will see that we talked about average valence electron energy.
如果你注意到昨天或者前天的事，你将看到,我们讨论的是平均价电子能。
-
0eV This is almost 20 eV, high average valence electron energy, greater than 13 electron volts.
它的价电子能是，这是很高的价电子能，比13电子伏要高。
-
And this looks a lot like the average valence electron energy where the lowest values of electronegativity are in the metallic zone and the highest values of electronegativity are on the nonmetallic zone.
这看起来像是平均电子能,最低的电负性在,金属区最高的电负性在,非电子区。
-
Place the non-bonding pairs on peripheral atoms first, which the higher average valence electron energy.
首先将孤对电子放在外围的原子，那儿具有较高的平均价电子能。
-
And up in the other extreme are elements with very high average valence electron energy.
和那些特别元素,它们具有很好的平均价电子能。
-
They have the highest average valence electron energy in any shell.
它们有最大的价电子能,任意一层都是这样。
-
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。
-
So, how does average valence electron energy very across the periodic table?
那么平均价电子能,怎样才能对元素周期表产生很大影响呢？
-
It's got a very low average valence electron energy.
它的平均价电子能很低。
-
So, when the value of the average valence electron energy lies between 11 eV and 13 eV, we have these elements that are neither fish nor fowl, and you'll see in a little bit their unique electrical properties.
所以，当平均价电子能,在11eV到13eV之间时，这些元素介于金属和非金属之间，你们将进一步,看到它们独特的电性质。
应用推荐