I showed you the distance between the letters 'A' and 'Z', between day and night."
VOA: special.2009.03.28
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。
Suppose f of x, y, z equals k1, that is my equation, s1 and it gives me a solution s1.
假设我的方程是这样,然后给出了一个解。
Musical performers also included Madonna,Jay-Z,Rihanna, Bono and the Edge.
VOA: special.2010.02.01
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。
Otis B.Driftwood. And Doctor Hugo Z.Hackenbush.
VOA: special.2009.07.19
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。
"The book is Darwin's Universe: Evolution from A to Z, and it is a life's work,"
VOA: standard.2009.11.25
Barthes, while writing this--he's writing what has perhaps in retrospect seemed to be his most important book, it's called S/Z.
巴特在创作这篇文章的时候,根据他的回忆这应该是他最重要的一本书,名叫《S\Z》
X Y Z It's more interestingly named an X or Y or Z.
你也可以把它命名为。
Z Compressibility factor, z.
压缩系数。
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。
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。
What is this orbital? Yup. And there's only 2pz one correct answer here, which is to 2 p z.
它的轨道是什么?,嗯,这里,只有一个答案,那就是。
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。
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。
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。
But what you should be able to do is take a look at a list of answers for what we're saying z effective might be, and determining which ones are possible versus which ones are not possible.
但是你们应该能够做到的,是看一下这个可能的,有效电荷量的答案列表,并且确定哪些是可能的,哪些是不可能的。
The first is this the z effective, or how much charge is actually in the nucleus that's felt, Z or the I guess we would say the z, how much the charge is on the nucleus that holds it close together.
第一个是有效核电量,或者说实际感受到的核电荷量,又或者我想我可以说就是,使它们保持在一起的,原子核的电荷量。
z So in our first case, our first extreme case, would be that the z effective that is felt by electron number 1, is going to be plus 1.
被1号电子感知到的有效的,是+1所以,我们所能做的是计算出,我们从这个。
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。
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。
Yeah, I've still got a binding for z and I'm giving it the same test, but notice now I've got the two same commands but they have different indentation.
对,我还是对z进行了绑定,我还是要对它进行同样的测试,但是请注意现在我有了两个同样的命令,但是它们有不同的缩进。
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。
All right, it's so if I looked at it, sorry, IF x is less than y, THEN check to see IF x is less than z, and if that's true, print out x is the smallest.
好,代码是这样的,对不起,是不是x比y小,然后去看看是不是x比z小,如果都为真的话,显示x为最小值。
And just as with variables, you should use some common sense, some style here, and the function's name should X Y communicate what it does, calling it X or Y or Z is generally not all that helpful.
就像变量,你使用一些常识,一些类型,和函数名需要,传达它所做的事情,把它叫做,或者Z通常是没有什么用处的。
If we have a higher z effective, it's pulled in tighter, we have to put in more energy in order to eject an electron, so it turns out that that's why case 2 is actually the lowest energy that we need to put in.
而如果有效核电量更高,原子核的束缚也就更紧,我们不得不输入更多的能量来打出一个电子,这就是第二种情况,所需要输入的,能量更少的原因。
So here we have that graphed here, Z we have atomic number z graphed against ionization energy, so, let's fill in what the actual atoms are here, and we can see in general, yes, we're following the trend.
这就是我们要画的,横坐标是原子序数,纵坐标是电离能,让我们把真正的原子填上去,我们可以看出,总体来说,没错,满足规律。
And note that as Z increases, as the proton number increases the radius decreases for a given n number.
并注意到当Z不断增加,对于一个给定的n,即当质子数增加的时候,半径的n值就减小了。
x y z And I have another equation f of x, y, z.
若我有另一个方程。
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