The Chemical Reaction Concept

There is 2 types of elements when it comes to chemical reaction in our nature : Noble Gases , Reactive elements ( all of the other elements).

• Noble Gases :

The most stable elements which don't undergo any chemical reaction (at normal condition) with other elements or with each other.

Because their outermost energy level is completely filled with electrons.

Their molecules are mono-atomic such as (He,Ne,Ar,Kr,Xe,Rn)

• Reactive Elements :

All other elements are reactive to some extent, they undergo chemical reactions to complete their outermost shell by accepting , losing , sharing electrons.

The Valence electrons play an important role in the formation of the bonds. So the scientist G.N.Lewis introduced a simple method to represent the valence electrons by using dots

You can open the picture to understand more about the steps.

Resource: El moasser book