Molar Mass: 490.1281. The metal cation is named first, followed by the nonmetal anion as illustrated in Figure \(\PageIndex{1}\) for the compound BaCl2. Similarly, O2− is the oxide ion, Se2− is the selenide ion, and so forth. The compound’s name is iron(II) phosphate.

Formula: Au2S3. The same issue arises for other ions with more than one possible charge. Example Reactions: • Au2S3 + 3H2 = 2Au + 3H2S. From a list of almost 2000 names and formulas, students will be given the opportunity to practice their ability to name ionic compounds, given the formula, and determine the formula given the name. 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). If we were to use the stems and suffixes of the common system, the names would be ferrous chloride and ferric chloride, respectively (Figure \(\PageIndex{3}\)) .

For example, consider FeCl2 and FeCl3 . Using the names of the ions, this ionic compound is named calcium chloride. aluminum phosphate: c. Neither charge is an exact multiple of the other, so we have to go to the least common multiple of 6. Now that we know how to name ions, we are ready to name ionic compounds. The crystal structure of AuF3 consists of spirals of square-planar AuF4 units. This system is used only for elements that form more than one common positive ion. The name of a monatomic cation is simply the name of the element followed by the word ion.

This section begins the formal study of nomenclature, the systematic naming of chemical compounds. Oxide always has a 2− charge, so with three oxide ions, we have a total negative charge of 6−. Chloriide always has a 1− charge, so with two chloride ions, we have a total negative charge of 2−. Example \(\PageIndex{3}\): Naming Ionic Compounds. Gold(III) Fluoride. It is a powerful fluorinating agent.. The compound’s name is iron(II) phosphate. Unless otherwise noted, LibreTexts content is licensed by CC BY-NC-SA 3.0.

We do not call the Na+ ion the sodium(I) ion because (I) is unnecessary.

c. Neither charge is an exact multiple of the other, so we have to go to the least common multiple of 6. The name of the compound is aluminum phosphate. There are two ways to make this distinction. We also acknowledge previous National Science Foundation support under grant numbers 1246120, 1525057, and 1413739. Synonyms: gold trifluoride. For more information contact us at [email protected] or check out our status page at https://status.libretexts.org. The second system, called the common system, is not conventional but is still prevalent and used in the health sciences. Thus, Na+ is the sodium ion, Al3+ is the aluminum ion, Ca2+ is the calcium ion, and so forth. Thus, Fe2+ is called the iron(II) ion, while Fe3+ is called the iron(III) ion. Iron can also have more than one possible charge. Preparation. The ammonium ion has a 1+ charge and the sulfide ion has a 2− charge. Marisa Alviar-Agnew (Sacramento City College).

[2] It is a powerful fluorinating agent. Formula: AuF3. In the second compound, the iron ion has a 3+ charge, as indicated by the three Cl− ions in the formula. a. The word ion is dropped from both parts. Some anions have multiple forms and are named accordingly with the use of roman numerals in parenthes.

This means that the two cobalt ions have to contribute 6+, which for two cobalt ions means that each one is 3+. Positive and negative charges must balance. Subscripts in the formula do not affect the name. Example \(\PageIndex{5}\): Naming Ionic Compounds. This page was constructed from content via the following contributor(s) and edited (topically or extensively) by the LibreTexts development team to meet platform style, presentation, and quality: CK-12 Foundation by Sharon Bewick, Richard Parsons, Therese Forsythe, Shonna Robinson, and Jean Dupon. AuF3 can be prepared by reacting AuCl3 with F2 or BrF3.



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