我感觉在某个地方仍然有负号的问题。

I think there's still a minus sign problem somewhere.

youdao

So we have 4 plus 5, but we're actually not done yet, because it's c n minus, so if we have minus, we actually have an extra electron in our molecule.

我们有四个加上五个，但是我们实际上还没做完，因为这是个负离子，所以如果我们有这个负号，那么我们的分子实际上还有一个额外的电子。

麻省理工公开课 - 化学原理课程节选

Another way to say that it's going to be less, so you don't get confused with that the fact this is in the numerator here, there is that negative sign so it's less energy but it's a bigger negative number that gives us that less energy there.

另一个方式去说它将会变得很低实用，你们不用在这里的计算器的事实感到迷惑,这里有一个负号实用，它是更少的能量,但它是一个更大的数字,这里了它给了我们更少的能量。

麻省理工公开课 - 化学原理课程节选

We have the minus because we're adding a negative charge from the electron.

有这个负号的原因是,我们得到一个电子后增加了一个单位负电荷。

麻省理工公开课 - 化学原理课程节选