But it's a struggle to keep the center open.

VOA: standard.2010.04.29

So, we keep the atoms with the lowest ionization energy in the center.

因此，我们把电离能,最低的原子放在中间。

麻省理工公开课 - 化学原理课程节选

So, we keep the atoms with the lowest ionization energy in the center.

因此，我们把电离能,最低的原子放在中间。

麻省理工公开课 - 化学原理课程节选