Inorganic Chemistry
Ferric iron is a d5 center, meaning that the metal has five "valence" electrons" in the 3d orbital shell. The magnetism of ferric compounds is mainly determined by these five electrons, and their behavior depends on the number and type of ligands attached to iron, as described by ligand field theory. Usually ferric ions are surrounded by six ligands arranged in octahedron. Sometimes three and sometimes as many as seven ligands are observed. A common ferric compound is ferric chloride (FeCl3).
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