Читать книгу Solid State Physics - Philip Hofmann - Страница 45

1 2.1 Interatomic potential: Consider the model interatomic potential as a function of interatomic distance given by the equation(2.15) where and are parameters of the model.What is the physical origin of the strongly repulsive part of the potential?The Coulomb repulsion between the two nuclei.The increase of the electron energies due to the overlap of the electron clouds.What is the equilibrium distance between two atoms if their interaction is described by the potential in Eq. (2.15)?....What is the minimum value of ?

2 2.2 Cohesive energy: In an ionic solid, which energy is the largest?The cohesive energy.The lattice energy.Depends on the particular ionic solid.

3 2.3 Bonding and cohesive energy: When ordering the following elemental solids according to their cohesive energy (smallest to largest), which is the correct order?Pb, Ar, W.Ar, Pb, W.W, Pb, Ar.Ar, W, Pb.

4 2.4 Bonding type and structure: Which bonding types do typically lead to close‐packed crystal structures?Covalent bonding.Metallic bonding.Van der Waals bonding.A. and B.B. and C.