HBr So for example, if I want to look at HBr there's a simple case, right, hydrogen bromine.

如果我想研究,这是个简单的例子，溴化氢。

麻省理工公开课 - 热力学与动力学课程节选

He saw that if you take the atomic mass of chlorine, 2 add it to the atomic mass of iodine, divide by two, you get something that is really close to the atomic mass of bromine.

他看到，如果你将氯的原子质量，加上碘的原子质量，除以，得到的数将与,溴的原子质量很接近。

麻省理工公开课 - 固态化学导论课程节选

There is a striking parallel here in that the group one elements have a tendency to want to give up electrons, F Cl Br whereas the fluorine, chlorine, bromine, have a tendency to attract electrons.

这儿有高度的相似性,每个组都有,失去电子的趋势的，相反的，则是有得电子的趋势。

麻省理工公开课 - 固态化学导论课程节选