It's a very appealing kind of a priori theory, but the thing about theories is they're supposed to make predictions.
这是一个很有吸引力的早期理论,但是理论的意义在于,它们可以被用来进行预测。
All right, so we can now see a little bit of what the power of molecular orbital theory is in predicting what kind of bonds we're going to see in molecules, or whether or not we'll see this bonding occur at all.
好了,我们已经可以看到一点,分子轨道理论在预测分子中,所成的键或者分子,能不能成键方面的能力了。
If some of the things they predict don't come true, the theory has to be disregarded and there are many, many, many counter examples to financial market efficiencies.
如果预测的一些事情并没有成为现实,那么这些理论就会被摒弃而且我们也有很多,很多,与金融市场有效论相反的例子。
It just turns out to be wrong but another way-- And so one way to attack and address a scientific theory is to view it as just to see whether or not it works.
但最终被证明是错误的-,评判一个理论,是否属于科学理论的另一种情况,就是看它是否成功的进行了预测。
This was something we could not predict using Lewis structures, but we can predict using MO theory that we have a radical species here.
这是我们从Lewis结构里不能预测的,但我们可以用分子轨道理论,预测自由基。
And there's actually a way that we can make predictions here, and what I'll tell you is molecular orbital theory predicts that h e 2 does not exist because it's not stabilized in terms of forming the molecule.
其实我们有一种办法可以做出预测,我要告诉你们的是分子轨道,理论预测He2不存在,因为它形成分子不稳定。
You wouldn't be expected to be able to guess that this would happen, because using any kind of simple theory, we would, in fact, predict that this would not be the case, but what we find experimentally is that it's more stable to have half filled d orbital than to have a 4 s 2, and a 3 d 4.
你们不用预期有能力,猜出这个会发生,因为使用任一种简单的理论,我们事实上可以预测不会是那种情况,但是我们在实验中发现的,是半填充d轨道比,4s23d4更加稳定。
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