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

顶部是系元素，底部是锕系元素。

But the lanthanides on top there.

但是那系元素呢。

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

们朋友系元素所有这些东西成为可能。

Halogens, Noble gases, lanthanides or rare earth elements.

卤素、惰性气体、系元素或稀土元素。

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

好， 因此铕几乎位于系元素中间。

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

当然，在下方，在系元素和锕系元素小岛上， 你 f 轨道：4f 和 5f。