How and why atoms combine.
Filled s and p orbitals in outer shell
All orbitals in outer shell filled
Filled d and f orbitals in outer shell
If the difference in values is greater than 1.7, the bond is more likely to be ionic
If the difference in values is greater than 1.7, the bond is more likely to be covalent
If the difference in values is less than 1.7, the bond is more likely to be ionic