They tend to have the same number of valence electrons.

它们往往具有相同数量的价电子。

So large, that the valence electrons aren't held very strongly by the nucleus.

如此之大，以至于价电子不会被原子核牢固地保持。

Once again, it has one valence electron, one electron in its outermost shell.

同样，它有一个价电子，一个位于最外层的电子。

And valence electrons are electrons in the outermost shell they tend to coincide, although there's a slightly different variation.

价电子是最外层的电子，它们往往重合，尽管变化略有不同。

Because they have eight valence electrons.

因为它们有八个价电子。

Hydrogen in that first shell just wants to get to two valence electrons like helium has.

第一个壳层中的氢只想像氦一样获得两个价电子。

Helium has two Valence electrons, its electron configuration is one S two.

氦有两个价电子，其电子构型为一S二。

They have very similar properties and that's because they have two valence electrons, two electrons in their outermost shell.

它们具有非常相似的特性，那是因为它们有两个价电子，两个电子位于最外层。

And hydrogen is a little bit of a strange character because hydrogen isn't trying to get to eight valence electrons.

氢有点奇怪，因为氢并没有试图获得八个价电子。

How many valence electrons does it have?

它有多少个价电子？

One, two, three, four, five, six valence electrons.

一、二、三、四、五、六个价电子。

They reside in an atom’s outer shell as valence electrons and are easily plucked off and carried around, when acted upon by an outside force.

它们以价电子的形式存在于原子的外壳中， 当受到外力作用时， 它们很容易被剥离并随身携带。

These are highly reactive because they have seven valence electrons.

它们具有很高的反应性，因为它们有七个价电子。

Here I did it kind of just drawing these, you know, these valence electrons as these dots.

在这里，我只是把这些，你知道的，这些价电子画成这些点。

They reside in an atom's outer shell as valence electrons and are easily plucked off and carried around, when acted upon by an outside force.

自由，并卡入外壳 原子作为价电子，然后。

How many Valence electrons does sodium have?

钠有多少个价电子？

They would love nothing more than to get one more valence electron.

他们只想再得到一个价电子。

Let's look at the periodic table to make sure that we're not-- oxygen has six valence electrons, right?

让我们看看元素周期表，以确保我们不是——氧有六个价电子，对吗？

The valence electrons, these are the electrons that are going to react, which tend to be the outermost shell electrons, but there are exceptions to that.

价电子，这些是将要发生反应的电子，它们往往是最外层的电子， 但也有例外。

All of the elements in group two are going to have two Valence electrons.

第二组中的所有元素都有两个价电子。