Why are valence electrons important?

1 Answer
Mar 19, 2018

Answer:

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:

https://www.ptable.com/

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