The attractive interactions between cations and mobile electrons in metallic solid is called

Explain the formation of London forces.

The lattice enthalpy of an ionic compound is the enthalpy change when one mole of an ionic compound in its solid state dissociates into its ions in the gaseous state. It is impossible to determine it directly by experiment. Suggest and explain an indirect method to measure the lattice enthalpy of $NaCl_{(s)}$.

Which has the weakest bond?

Graphite is a soft solid lubricant extremely difficult to melt. The reason for this anomalous behaviour is that graphite

Diamond is extremely hard whereas graphite is soft. This is because