# Why are valence electrons important?

##### 1 Answer
Mar 19, 2018

They give us the reactivity of the elements.

#### Explanation:

If the valence electrons of elements are really close or really far to $8$, like $1$ or $7$, those elements tend to be very reactive, and don't generally have a lot of oxidation states.

The alkali metals (group $1$ elements) each have $1$ valence electrons, so they tend to be very reactive, and readily lose that electron.

The halogens (group $7$ or $17$ elements) each have $7$ valence electrons, and will react with almost anything just to get that extra electron to complete its octet.

Have a look at the elements on the periodic table:

Can you predict on which elements are going to be reactive?