The z effective is lower, so we have to put less energy in to get an ion out.

它的有效核电量更低，所以我们只需要更少的能量就能打出一个离子。

麻省理工公开课 - 化学原理课程节选

So, in other words, this c l minus is actually lower in energy than the reactants were.

也就是说，负一价氯离子,比原来的反应物的能量更低。

麻省理工公开课 - 化学原理课程节选