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Iron ii arsenide (Fe2As) is a highly crystalline solid with an oxidation number of 3.
It is a member of the Zintl phase of the element group III and has been used as a semiconductor, as a pigment in ceramics, and in hair dyes. It is also a valuable reagent for treating exhaust gases and lessening heavy metal pollution.
The IUPAC formula for Fe2As is a mixture of trigonal prismatic sulfide ions with octahedral iron centers. It is commonly found in hematite, troilite, goethite, and pyrrhotite minerals.
A Guide to Naming Simple Ionic Compounds
Identify the cation name and then the anion name. If the cation can have more than one possible charge, use the Stock system, but if it can only have one, name the cation with a stem of -ic/-ous and the name of the anion without numerical prefixes.
In addition to naming the ionic compound, you must remember to name each pair of ions separately. This helps you to remember how many ions are involved in each formula and can also help you to figure out which chemical reaction has occurred when a given combination of ions is added together.
There are three basic types of ionic compounds. Type I is the monatomic ionic compounds, which contain only the elements themselves with no non-metal ions. Table 3.5.2 lists some common monatomic ions and gives the IUPAC formulas for each. In addition, Type II is the binary ionic compounds, which contain transition metals with non-metal ions.