What I just spent many lectures discussing is the fact that we can not know how far away an electron is from the nucleus, so we can't actually know the radius of a certain atom.

我花了这么多课时所讨论的正是我们，不可能知道电子离原子核有多远这一事实，因此我们不可能知道某个原子的半径。

youdao

In this model the arrangement of bonds around the central atom is considered to depend upon how many valence-shell electron pairs.

在这个模型中，认为围绕中心原子的化学键的排列取决于价层中电子对的数量。

youdao