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 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.

Chemical Bonds Physical Bonds

1. Ionic Bonds 1. Hydrogen Bond

2. Coordinate bond 2. Metallic bond

3. Covalent Bond:-

• pure covalent bond
• Non-polar covalent bond