Small corrections to the lattice energy for ionic

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Presentation transcript:

Small corrections to the lattice energy for ionic Werner Heisenberg Small corrections to the lattice energy for ionic and partially polar solids Copenhagen Group, 1934 Niels Bohr Correction from quantum mechanics Wolfgang Pauli Localization of particles kinetic energy (uncertainty principle) Energy increase by even 10 times smaller than typical van der Waals interaction Hydrogen Bond two electronegative atoms acceptor donor For more information see

Hydrogen bond in ice crystals Hydrogen bond in the DNA strands held together by hydrogen bonds between nitrogenous bases

? Metallic bond e.g. Li+ e- SEA OF MOBILE VALENCE ELECTRONS What do we learn from this model

Melting and Boiling Points lot of energy required to break the strong metallic bond high melting & boiling points Electrical Conductivity metals are good electrical conductor since electrons in the sea of electrons are mobile, metals are able to conduct electricity when solid or molten and thermal

Malleable and Ductile metallic bonds are strong but not rigid when a force is applied, layers of atoms can slide over one another axle of a generator, weight: 200 000 kg Later in this course: more detailed QM picture of electrons in metals