periodic - Lorentz JÄNTSCHI

•
•
Interaction models
(covalent bond model) The covalent bond model is a
representation of the chemical bond which assumes that
every bond is created when two (by two) atoms are put
together (by two by two atoms). It has as limit cases the
metallic bond (Me - metal; Men molecule; n → ∞ metal
network), ionic bond (A, B chemical species with - see
below - different electronegativity; AB molecule; A + B- separating of the electric charges; A + , B- ions) and
coordinative (such as: CaCl2, Ca2+ : 1s2 2s2 2p6 3s2 3p6 3d0 4s0 ; CaCl2·6H2O, Ca2+ : 1s2 2s2 2p6 3s2 3p6 3d10 4s2 -
antarcticite).
(hybridization models) Hybridization models are able to
explain the differences of the energies (at electronic
orbital levels) when they join together in chemical bonds
(see Representation of hybridization process).
Hybridization conserves the total number of energy
levels (orbital levels).