Positron or electron-atom collision theory is a main and fundamental area of atomic and molecular physics.

正（负）电子与原子的碰撞理论是原子与分子物理主要的研究领域。

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If the atom is fixed mass, and the electron is tiny, it must be the positives have all the mass.

如果是原子质量一定，而电子很小，那么带正电荷的部分几乎占据了全部质量。

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When we talk about orbitals in multi-electron atoms, they're actually lower in energy than the corresponding H atom orbitals.

当我们讨论多电子原子的轨道时，它们的能量实际上比对应的氢原子轨道要低。

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So when we talk about orbitals in multi-electron atoms, they're actually lower in energy than the corresponding h atom orbitals.

它们的能量实际上,比对应的氢,原子轨道要低。

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One of the main difference is is that when you're talking about multi-electron orbitals, they're actually smaller than the corresponding orbital for the hydrogen atom.

其中最主要的区别之一,是当你讨论多电子轨道时,它们实际上，要比对应的氢原子轨道,要小一些。

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This should make sense, because if an atom has a very high electron affinity, that means it's really happy taking an electron from another atom, or taking a free electron -- that that's very favorable.

这应该是合理的，因为如果一个原子有很高的电子亲和能，这意味着,它非常乐意从另外一个原子那里夺取一个电子，或者得到一个自由电子--这是非常利于发生的。

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Pushing this electron out to its lonely periphery - and make a Rydberg atom - requires energy.

BBC: World first for strange molecule