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。
And there he was able to identify the alpha particle as the helium nucleus.
他证实了,阿尔法粒子就是氦核。
So what is the charge on a helium nucleus?
那么氦原子核的电荷量是多少呢?
We have a helium nucleus and one electron.
我们有一个氦核和一个电子。
So, all that's left is the helium nucleus, two protons, two neutrons.
仅留下氦核,两个质子,两个中子。
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