Lecture Note - Chemical Nomenclature

Lecture Note - Chemical Nomenclature - Chemical...

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Chemical Nomenclature Ionic Compounds 1. Name the cation (the more electropositive one) first and the anion (the more electronegative one) second. 2. Monoatomic cations take their name from the element name. 3. Monoatomic anions take their names from the first part of the element name and then add "-ide" . Cation Name H + Hydrogen Na + Sodium Al 3+ Aluminum Anion Name H - Hydride Cl - Chloride O 2- Oxide 4. When elements form more than one type of ionic compound Roman numerals are used to indicate the charge on the cation. Fe 2+ and O 2- give FeO = Iron(II) Oxide Fe 3+ and O 2- give Fe 2 O 3 = Iron(III) Oxide Sn 2+ and Cl - give SnCl 2 = Tin(II) Chloride Sn 4+ and Cl - give SnCl 4 = Tin(IV) Chloride 5. So the examples above would be, under the older system, FeO = Ferr ous Oxide Fe 2 O 3 = Ferr ic Oxide SnCl 2 = Stann ous Chloride SnCl 4 = Stann ic Chloride 6. Here are some other examples Ion Latin Name Systematic Name Au + Aurous Gold(I) Au 3+ Auric Gold(III) Cu + Cuprous Copper(I) Cu 2+ Cupric Copper(II) 7. For polyatomic ions, you should memorize the names below.
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