So what is the charge on a helium nucleus?

那么氦原子核的电荷量是多少呢？

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We have a helium nucleus and one electron.

我们有一个氦核和一个电子。

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The first type discovered -- alpha decay -- is when a radioactive particle emits a Helium nucleus !

我们发现的第一种衰变方式——阿尔法衰变——是放射性粒子产生氦分子！

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So let's take two cases of shielding if we're talking about, for example, the helium, a helium nucleus or a helium atom.

所以我们来对屏蔽举两个例子,如果我们在讨论氦，举例来说一个氦原子核或者氦原子。

麻省理工公开课 - 化学原理课程节选

We have a helium nucleus and one electron.

我们有一个氦核和一个电子。

麻省理工公开课 - 固态化学导论课程节选

So what is the charge on a helium nucleus?

那么氦原子核的电荷量是多少呢？

麻省理工公开课 - 化学原理课程节选

Terrestrial helium, for example, consists of a small amount of helium-3 (the nucleus of which has two protons and one neutron), and mostly helium-4 (which has 2 protons and 2 neutrons).

BBC: ET gases caged on Earth