Naming Binary Ionic Compounds with a Metal That Forms More Than One Type of Cation

If you are given a formula for an ionic compound whose cation can have more than one possible charge, you must first determine the charge on the cation before identifying its correct name. For example, consider FeCl₂ and FeCl_{3 .} In the first compound, the iron ion has a 2+ charge because there are two Cl⁻ ions in the formula (1− charge on each chloride ion). In the second compound, the iron ion has a 3+ charge, as indicated by the three Cl⁻ ions in the formula. These are two different compounds that need two different names. By the Stock system, the names are iron(II) chloride and iron(III) chloride (Figure 1 ).

Table 1: Naming the FeCl2 and FeCl3 Compounds in the Modern/Stock System.

Name of cation (metal) + (Roman Numeral in parenthesis) + Base name of anion (nonmetal) and -ide

If we were to use the stems and suffixes of the common system, the names would be ferrous chloride and ferric chloride, respectively (Figure 5.7.3

) .

Table 2 : Naming the FeCl2 and FeCl3 Compounds in the Old/Common System

مواضيع ذات صلة

تسمية المركبات الجزيئية Molecular Compounds

تسمية المركبات الأيونية Ionic Compounds

تسمية المركبات Naming Compounds

صيغ المركبات الأيونية Formula of Ionic Compounds

الصيغ الأولية Empirical Formulas

الصيغ الجزيئية Molecular Formulas

الأيونات Ions

الجزيئات Molecules

الجدول الدوري The Periodic Table

العدد الذري وعدد الكتلة والنظائر Atomic Number, Mass Number and Isotopes

النيوترون The Neutron

البروتون والنواة The Proton and the Nucleus