Collectively, by the way, these particles are known as nucleons.

顺便说一下， 这些粒子统称为核子。

Because of this, we'll often refer the two particles collectively as nucleons.

因此，我们常常将两种粒子的集合原子核。

Because of this, we’ll often refer the two particles collectively as nucleons.

因此，我们将通常把这些两粒子统称为核子。

And helium in its native state has a total of four nucleons, two protons, two neutrons.

而氦在其原始状态下总共有四核子，两质子，两中子。

And in radioactive decay nucleon number and charge before and after are going to be equal.

而在放射性衰变中，衰变前后的核子数量和电荷将。

The mass number is just the total number of nucleons in the nucleus, which is different from atomic mass.

质量数只是原子核中核子的总数， 它不同于原子质量。

And so is nucleon number conserved?

那么核子数守恒吗？

But even though those numbers of nucleons add up, remember: Mass and energy are equivalent.

但即便核中的数字被加总了，还是要记得：质能守恒。

Nucleon number before and charge before has to equal nucleon number and charge after.

之前的核子数和之前的电荷必须于之后的核子数和电荷。

Now, a unique part of beta decay is that no nucleons are emitted during the decay process.

现在，一beta衰变的特别部分是衰变产生时没有一核子。

Nucleons remember are the protons and neutrons that we have inside the nucleus of an atom.

记住，核子是原子核内的质子和中子。

And so it is not about the electrons anymore, it is about the nucleons themselves.

所以这不再与电子有关，而是与核子本身有关。

But while the total binding energy still increases for nuclei larger than iron, the binding energy per nucleon, in fact, decreases.

但是，虽然比铁更大的原子核的总结合能仍在增加，每核子的结合能实际上是在减少。

How many nucleons did we have before the reaction?

反应之前我们有多少核子？

And so let's study conservation of nucleon number and charge.

因此让我们研究核子数和电荷的守恒。

And so let's start with nucleon number.

因此让我们从核子数开始。

And we have to see the nucleon number.

我们必须知道核子数。

So conservation of nucleon number and charge will always exist in every nuclear reaction and also in radioactive decay, or nuclear decay.

因此，核子数和电荷的守恒在每核反应中以及在放射性衰变或核衰变中始终存在。

What is going to be our nucleon number here?

这里的核子数是多少？

While the strong force acts on nucleons, the weak force alters quarks, the fundamental particles that make up both protons and neutrons.

虽然强力用于核子，弱力则改变夸克，而夸克是构成质子和中子的基本粒子。