关于原子核半径的知识有各种来源。
Information on nuclear radius comes from a variety of sources.
我们讨论的是概率，但我们说的是最可能的半径，离原子核更远。
We are talking about probability, but what we're saying is that most probable radius is further away from the nucleus.
我们讨论了对于氢原子1s轨道，它的最可能半径在距离原子核a 0处。
And what is discussed is that for a 1 s hydrogen atom, that falls at an a nought distance away from the nucleus.
举例来说当我们讨论径向概率分布时，距离原子核最可能的半径是，比s轨道半径，更近的可以离原子核有多近。
For example, when we're talking about radial probability distributions, the most probable radius is closer into the nucleus than it is for the s orbital.
原子核的半径，相对于整个原子的半径来说，是1比10000这个数量级。
The radius of the nucleus as compared to the radius of the entire atom is on the order of about one to 10,000.
如果在原子核外侧,我们发现某一半径和n的平方成正比，也就是说当n为2时半径等于。
If I look at something that goes as n squared, if this is the edge of the nucleus here and if this is r1, 4 it says when n goes to two the radius goes to four.
我花了这么多课时所讨论的正是我们，不可能知道电子离原子核有多远这一事实，因此我们不可能知道某个原子的半径。
What I just spent many lectures discussing is the fact that we can not know how far away an electron is from the nucleus, so we can't actually know the radius of a certain atom.
我们将看到它是减小的，因为电子会感受到越来越强的吸引力，所有的电子将会被原子核拉得越来越近，所以原子半径将越来越小。
We are expecting to see that it decreases because it's feeling a stronger pull, all the electrons are being pulled in closer to the nucleus, so that atomic size is going to get smaller.
我们将看到它是减小的，因为电子会感受到越来越强的吸引力，所有的电子将会被原子核拉得越来越近，所以原子半径将越来越小。
We are expecting to see that it decreases because it's feeling a stronger pull, all the electrons are being pulled in closer to the nucleus, so that atomic size is going to get smaller.
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