The EV-1 was on the market in the 1990s, but GM discontinued it because of impracticality.

VOA: standard.2010.07.30

It's got an average valence electron energy of about 16 eV, 16.5 eV, which is a lot greater than 11.

它的平均价电子能,大约是16eV，16。5eV，那比11要多很多。

麻省理工公开课 - 固态化学导论课程节选

If you flip the Periodic Table over you will have the ionization energy of sodium, first ionization energy, 5eV and it is about 5 eV which, when you convert, 496kJ/mol is a whopping 496 kilojoules per mole.

如果浏览周期表,你可以得到钠的离子化能，第一电离能，大约，当你转换的时候，是巨大的。

麻省理工公开课 - 固态化学导论课程节选

eV It is a unit of energy. Now, this is 1.0 eV.

它是以单位的能量，现在，这有1。

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When you add this whole thing up, -411kJ/mol it gives you a net of minus 411 kilojoules per mole or about 4 eV per ion pair.

当你全部加上时，得到净能量,或者是4eV每个离子对。

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So, when the value of the average valence electron energy lies between 11 eV and 13 eV, we have these elements that are neither fish nor fowl, and you'll see in a little bit their unique electrical properties.

所以，当平均价电子能,在11eV到13eV之间时，这些元素介于金属和非金属之间，你们将进一步,看到它们独特的电性质。

麻省理工公开课 - 固态化学导论课程节选