Metal Compounds for Sale

Metal Compounds can be classified according to the number of different elements that they contain: binary (two), ternary (three), etc.
An example is the compound Mg2Sn.  This is made by fusing together a mixture of magnesium and tin of the appropriate composition, and cooling the resulting melt. The product is homogeneous, as can be seen by cutting and polishing it, and examining the polished surface under a microscope. If more magnesium or tin is used than required by the formula Mg2Sn, the product ceases to be homogeneous - crystals of Mg2Sn can be seen embedded in a matrix of smaller crystals containing the excess of magnesium or tin. The compound Mg2Sn is a bluish-white lustrous solid, having all the properties of a metal.
Metallic compounds fall into one of two categories of compound:
1. Stoicheiometric compounds. These are compounds that obey the law of constant composition to very high accuracy, e.g. CH4, NaCl, Mg2Sn. They are also called “definite” compounds or “Daltonides”. [The word “stoicheiometric” comes from “stoicheiometry”, the name given to the measurement of the proportions of elements in compounds (Greek stoicheion, element, metron, measure).]
2. Non-stoicheiometric compounds. These have a variable composition within certain limits. They are also called “indefinite” compounds or “Berthollides” (after the French chemist Claude Berthollet, 1748-1822, who disputed the law of constant composition).
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