Those are the lanthanides on top and the actinides on the bottom.

顶部的是镧系元，底部的是锕系元。

But the lanthanides on top there.

但是那里的镧系元呢。

All that stuff is made possible by our friends, the lanthanides.

们的朋友镧系元使所有这些东西成。

Halogens, Noble gases, lanthanides or rare earth elements.

卤、惰性气体、镧系元或稀土元。

Ok, so europium is pretty much in the middle of the lanthanide series.

好的， 因此铕几乎位于镧系元的中间。

And below of course, in the little island of the lanthanides and actinides, your f-orbitals: 4f and 5f.

当然，在下方，在镧系元和锕系元的小岛上， 你的 f 轨道：4f 和 5f。