Chemical Bonding

1. Ionic Bond

1.1. the electronegativity difference between the bonded atoms is small or nonexistent

2. Covalent bonds

2.1. electrostatic interaction between atoms which have a large electronegativity difference

3. Hypervalent Bonding

3.1. there exists bonds which have significant non-bonding ionic quality to them

4. Metallic Bonding

4.1. bonding electrons are delocalized over a lattice of atoms