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I showed you the distance between the letters 'A' and 'Z', between day and night."
VOA: special.2009.03.28
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z So what we end up seeing is 34 that the z effective is equal to positive 1 . 3 4.
看到有效的,等于+1。
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z So, this is what we find the actual z effective is for an electron in the helium atom.
所以这就是我们得到了实际有效的,对于一个氦原子的电子。
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Musical performers also included Madonna,Jay-Z,Rihanna, Bono and the Edge.
VOA: special.2010.02.01
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For example, F x y z if I have an equation that looks like this, f of x, y, z.
打个比方，我有个这样的方程。
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Otis B.Driftwood. And Doctor Hugo Z.Hackenbush.
VOA: special.2009.07.19
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That statement says, get the value of x, which is this link, and give z a pointer to the same place.
这个声明的意思是，取得x的值，也就是连接指向的值，然后给z赋予一个指向同样位置的指针。
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X Y Z It's more interestingly named an X or Y or Z.
你也可以把它命名为。
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And the fudge factor is called z.
理想气体的体积。
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So what we're going to see is less shielding, which means that it will actually feel a higher z effective.
那么我们将会看到更少的屏蔽，这意味着将会感受到更大的有效核电量。
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And so what I get is the energy of the system at the equilibrium separation is given by minus z plus.
这就是通过减去z+得到得平衡分离时,我得到的能量体系。
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So why don't you go ahead and identify the correct electron configuration for carbon, 6 and I'll tell you that z is equal to 6 here.
所以你们为什么不开始,而且识别碳的正确的在你们做作业方面,电子构型，我会告诉你有效电荷量是。
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And if we experimentally know z what the ionization energy is, we actually have a way to find out what the z effective will be equal to.
我们实际上就有了一个办法,去找出有效的，等于多少,我们可以使用这里的方程。
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Not only are we taking away an electron here, but we're also going to decrease shielding, so the electrons that are already in there are going to feel a higher z effective and will be pulling and the atom will be getting smaller.
这不只是因为我们拿走了一个电子，还因为我们这样做会减小屏蔽效应，这样留下的电子,将会感受到更大的有效核电量,也就会感受到更强的吸引力，使得原子变得更小。
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XYZ I might as well do it as x, y, z because we are talking about something that is going in three space.
我最好设成,因为我们在讨论,三维的事物。
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This makes sense intuitively as well, Ze because z is just the atomic number.
他还发现原子核，的电荷是正的。
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We can also think about this in terms of z effective.
我们同样可以。
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They all have the same Z, the same proton number, but different A, which means number of neutrons varies.
有相同的Z，相同的质子数，但是不同的A，也就是中子数不同。
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So z equals 7 -- this is the cut-off where, in fact, the sigma orbital is going to be higher in energy than the pi 2 p orbitals.
所以z等于7-这是分界点，实际上，sigma轨道能量,要比π2p轨道高。
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And the nodal plane's going to be in the x z plane, or again, anywhere where phi is going to be equal to 0, that takes us to the x z plane.
节面是ｘｚ平面，又或者说是phi等于０的地方，这就是ｘｚ面。
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So, let's say we have an atomic number of 3, 3 that means we have 3 electrons, so we better hope to get our neutral atom that we have a charge of plus 3in the nucleus.
这也是很合理的，因为Z就是原子序数，假设原子序数是，那就有3个电子，那我们就希望,性原子有个带3个正电荷的原子核。
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In an extreme case b, we had a z effective of 2, so essentially what we had was no shielding at all.
我们有效的z是，所以本质上我们完全没有屏蔽。
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Let's bind z eh let's bind z to the-- f if I could type it would help-- say, f of 3. OK?
让我们给z赋值--如果我能打字就好了-,比方说？
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So you can see if you take phi, and you move it over 90 degrees, we're right here in the y z plane.
你们可以看到，把phi转到９０度，它就是ｙｚ面。
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So, we can have the 2 p x, 2 p y, and 2 p z orbitals.
所以我们有2个px2个py2个pz轨道。
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It adds x to y and stores it into z. But if someone wants to be a even a little more snarky, what does this program do?
它把x加上y，再把结果存到z中，但是如果有人,想要做的有点不合常理点呢，那这个程序会做什么？
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So what we can say is look at each of these separately, so if we start with looking at the 2 p z orbital, the highest probability of finding an electron in the 2 p z orbital, is going to be along this z-axis.
我们可以来分别看看这些图，首先来看看2pz轨道，在2pz轨道里,找到电子的最大概率，是沿着ｚ轴。
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2 So what we end up saying is that the z effective or the effective charge that that first electron feels is now going to be plus 2.
第一个电子感觉到的有效的z或者有效电荷现在是,我们再一次将它带入我们的方程。
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I'm binding a z to be some value, and then I'm going to run this.
我把z绑定到一个值上，然后运行下代码。
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Times the square of the elementary Z charge times n squared over Z.
乘以元电荷的平方,乘以n的平方除以。
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