2.18 (a) Briefly cite the main differences between ionic, covalent, and metallic bonding.
For these expressions, energies are expressed in electron volts per Na+ -Cl- pair, and r is the distance in nanometers. The net energy EN is just the sum of the two expressions above.
(b) State the Pauli exclusion principle.
2.19 Compute the percentage ionic character of the interatomic bond for each of the following compounds: MgO, GaP, CsF, CdS, and FeO.