There will normally be one electron circling about the hydrogen nucleus.

正常情况下，有一个电子，围绕着氢原子核运转。

youdao

Heavy water is heavy because the hydrogen in it weighs twice as much as ordinary hydrogen (it has a proton and a neutron in its nucleus, instead of just a proton).

重水之所以重是因为水中氢的重量是普通氢的两倍（它的原子核中有一个质子和一个中子，而不仅仅是一个质子）。

youdao

That is the electron in its lowest orbit, to the nucleus of atomic hydrogen.

那就是氢原子原子核外电子，最低轨道到情况。

youdao

Because what it tells is that we can figure out exactly what the radius of an electron and a nucleus are in a hydrogen atom.

我们可以,准确的算出,氢原子中,电子。

麻省理工公开课 - 化学原理课程节选

We're going to be looking at the solutions to the Schrodinger equation for a hydrogen atom, and specifically we'll be looking at the binding energy of the electron to the nucleus.

我们将研究下氢原子薛定谔方程的解,特别是电子和核子的结合能,我们将研究这部分。

麻省理工公开课 - 化学原理课程节选

That is the electron in its lowest orbit, to the nucleus of atomic hydrogen.

那就是氢原子原子核外电子，最低轨道到情况。

麻省理工公开课 - 固态化学导论课程节选

Heavy water is heavy because the hydrogen in it weighs twice as much as ordinary hydrogen (it has a proton and a neutron in its nucleus, instead of just a proton).

ECONOMIST: Longevity