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Additional recommended knowledge
Cadmium iodide forms crystals with hexagonal symmetry. The iodide anions form a hexagonal close packed arrangement while the cadmium cations fill alternating layers of octahedral sites. The resultant structure consists of a layered lattice. This same basic structure is found in many other salts and minerals. Cadmium iodide is mostly ionically bonded but with partial covalent character.
Cadmium iodide's crystal structure is the prototype on which the crystal structures many other compounds can be considered to be based. Compounds with any of the following characteristics tend to adopt the CdI2 structure:
Compounds with the CdI2 crystal structure
MgI2, TiI2, VI2, MnI2, FeI2, CoI2, CaI2, PdI2, PbI2.
Chlorides and bromides
MgBr2, TiBr2, VBr2, MnBr2, FeBr2, CoBr2.
Hydroxides of M2+
Mg(OH)2, Ni(OH)2, Ca(OH)2.
Chalcogenides of M4+
TiS2, ZrS2, SnS2, α-TaS2, PtS2;
TiSe2, ZrSe2, SnSe2, PtSe2;
SiTe2, TiTe2, CoTe2, NiTe2, PdTe2, PtTe2.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Cadmium_iodide". A list of authors is available in Wikipedia.|