So, that's the second quantum number.
这就是第二个量子数。
When we talked about binding energy, we just had one quantum number.
当我们说到能量时，我们只要一个量子数。
And I promise, this is the last quantum number that we'll be introducing.
我向你们保证，这是我们最后遇到的一个量子数。
And our equation for total nodes is just the principle quantum number minus 1.
总节点数等于，主量子数减1。
I think this is taken about two years after they discovered the fourth quantum number.
这张照片拍摄于他们发现，第四个量子数的两年后。
I think this is taken about two years after they discovered the fourth quantum number.
这张照片拍摄于他们发现，第四个量子数的两年后。
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