So, aluminum is about 50% denser than magnesium.

所以铝的密度比镁大一倍。

麻省理工公开课 - 固态化学导论课程节选

Magnesium is a liquid but it's less dense than magnesium chloride.

镁是液体,但是它的密度比氯化镁要小。

麻省理工公开课 - 固态化学导论课程节选

s And if we go ahead and superimpose the 3 s on top of the 3 p, you can see that the 3 s actually has some bit of probability density that gets even closer to the nucleus than the 3 p did.

如果我们继续将,重叠到3p上面，你们会看到3s事实上,有一点概率密度,距离原子核更近,比3p轨道。

麻省理工公开课 - 化学原理课程节选