The Pearson system describes smaller materials with high charge states using this term, which also names a property measured with the Persoz and Konig (*) pendulums.
In one discipline, a property of this name is proportional to the second derivative of the energy of a chemical system with respect to the electron number for a fixed nuclear charge. That property is also equivalent to one-half the difference between ionization potential and electron affinity. The Pearson system describes smaller materials with high charge states using this term, which also names a property measured with the Persoz and Konig (*) pendulums. This term can refer to an unusually high concentration of multivalent cations in a certain substance that results in the production of calcium and magnesium stearates when that substance is combined with soap. One property with this name can be measured with the Leeb rebound test, which employs a scleroscope, or on the Vickers or Rockwell scales. For 10 points, identify this term most famously describing a property whose value for curundum is 9 on the Mohs scale.
In one discipline, a property of this name is proportional to the second derivative of the energy of a chemical system with respect to the electron number for a fixed nuclear charge.
hardness