Material A = high elastic modulus and high melting temperature
Material B = low elastic modulus and low melting temperature
Explanation:
For material A, there is a high curvature to the inter-atomic potential, this is because of the strong nature of chemical bonding that exists in the material, and it takes a larger force for the change interatomic separation, which results in high elastic modulus and high melting temperature.
For material B, there is a short curvature to the interatomic potential, this is because of the wet nature of chemical bonding, and consequently, a much smaller force is needed for the change interatomic separation, which results in low elastic modulus and low melting temperature.
