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This indicates that by combining two lithiums, the energy of the combined system is lower than the energies of the atomic systems.
结果显示，两个锂结合后，其结合后的能量,比原子体系的能量要低。
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And what you find is when you have a bonding orbital, the energy decreases compared to the atomic orbitals.
你们发现当你有个成键轨道的时候，相比原子轨道能量要降低。
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Now I have lambdas associated with transitions between energy levels in atomic hydrogen.
现在我把波长和,氢原子中的,能级跃迁联系起来。
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We'll then take a turn to talking about the periodic table, we'll look at a bunch of periodic trends, including ionization energy, electron affinity, electronegativity and atomic radius.
然后我们再开始讲元素周期表，我们会看到很多周期性规律，比如电离能，电子亲和能，电负性以及原子半径。
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The electron's going to come out of that highest occupied atomic orbital, that one that's the highest in energy, because that's going to be the at least amount of energy it needs to eject something.
这个电子应该是从,最高的被占据轨道上出来的，它的能级是最高的，因为这样的话发射出它,只需要消耗最少的能量。
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So, if we look at the molecular orbital, that's actually going to be lower in energy than either of the two atomic orbitals.
如果我们看分子轨道的话，它实际上要比,两个原子轨道都要低。
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It makes sense that it's going to come out of the highest occupied atomic orbital, because that's going to be the lowest amount of energy that's required to actually eject an electron.
从最高占据轨道上,去掉一个电子是合理的，因为这样是发射一个电子,所损失的最低能量。
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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。
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So, let's think of the energy of interaction when we're comparing atomic orbitals to molecular bonding orbitals.
当我们比较原子轨道和分子轨道的时候,我们来考虑一下相互作用能。
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I would say with the aid of an energy level diagram explain the fact that helium is found as atomic gas and not molecular. How about this one?
我要说的是，在能级图的帮助下,可以解释氦气是单原子气体,而不是分子气体这一事实,那么这个呢？
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And that's going to be lower in energy than the two individual atomic orbitals.
它的能量要比,两个独立的原子轨道能量要低。
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That is the ground state energy of atomic hydrogen.
同时也是氢原子基态的能量值。
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It's going to be higher in energy than the individual atomic orbitals.
它比独立的,原子轨道要高。
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But actually there is a little bit of an energy cost into doubling up into a single orbital, because, of course, it takes energy when you create more electron repulsion, that's not something we want to do, but we have to do it here, and it turns out that that effect predominates over, again, the energy that we gain by increasing the atomic number by one.
但实际上，在一个轨道上放两个电子,确实会亏损一点能量，因为，当你加入更多电子，引起更大的排斥能,这显然会消耗能量，这不是我们想要做的，但是在这种情况下我们不得不做，结果这一影响，超过了增加一个,原子序数所得到的能量。
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So we would label our anti-bonding orbital higher in energy than our 1 s atomic orbitals.
我们应该把反键轨道标在,高于1s原子轨道能量的地方。
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What is the energy change going from two atomic hydrogens to one H2?
什么是能量的改变,从两个原子氢到H2分子？
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