Bond Strength
For a solid crystalline ionic compound the enthalpy change in forming the solid from gaseous ions is termed the lattice energy. The experimental value for the lattice energy can be determined using the Born-Haber cycle. It can also be calculated using the Born-Landé equation as the sum of the electrostatic potential energy, calculated by summing interactions between cations and anions, and a short range repulsive potential energy term. The electrostatic potential can be expressed in terms of the inter-ionic separation and a constant (Madelung constant) that takes account of the geometry of the crystal. The Born-Landé equation gives a reasonable fit to the lattice energy of e.g. sodium chloride where the calculated value is −756 kJ/mol which compares to −787 kJ/mol using the Born-Haber cycle.
Read more about this topic: Ionic Bond
Famous quotes containing the words bond and/or strength:
“They lived under a just and moderate government, and they admitted that one bond of their fidelity was that their rulers were the better men.”
—Titus Livius (Livy)
“I came to love my rows, my beans, though so many more than I wanted. They attached me to the earth, and so I got strength like Antæus. But why should I raise them? Only Heaven knows.”
—Henry David Thoreau (18171862)