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【正文】 natomic cation = name of the element, if there is only one such ion. calcium ion Ca2+ = sodium ion Na+ is called 3. Monatomic anion = root + ide Cl = CaCl2 = calcium chloride chloride chlorine 1 ionic pounds 1 Naming Binary Ionic Compounds ? Examples: NaCl ZnI2 Al2O3 Na2SO4 aluminum oxide sodium chloride zinc iodide polyatomic anion 1 Ionic pounds ? 1. Cation陽(yáng)離子 first, then anion陰離子 ? 2. Monatomic cation = name of the element, if there is only one such ion. calcium ion Ca2+ = sodium ion Na+ is called 3. Monatomic anion = root + ide Cl = chloride CaCl2 = calcium chloride 1 Ionic pounds 4 Cations able to take on more than one positive charge are labeled with Roman numerals in parentheses Cu Fe copper (I) ion copper (II) ion Cu2+ Fe2+ Fe3+ iron (II) ion iron (III) ion Older sysytem *In an older system of nomenclature, such ions are named by adding the suffixes –ous and –ic to a stem name of the element to indicate the ions of lower and higher charges, respectively. ferric ion ferrous ion cuprous ion cupric ion Examples of Older Names of Cations formed from Transition Metals (you do not have to memorize these) 1 ionic pounds a few, such as zinc, have only a single ion that is normally encountered, and you usually name them by just the metal name (zinc). you would not be wrong, however, for example, you named zinc as zinc (II) ion. 1 Ionic pounds ? 1. Cation陽(yáng)離子 first, then anion陰離子 ? 2. Monatomic cation = name of the element, if there is only one such ion. Binary Ionic Compounds: (5 points) calcium ion Ca2+ = sodium ion Na+ is called 3. Monatomic anion = root + ide Cl = chloride CaCl2 = calcium chloride 1 Ionic pounds 4 Cations able to take on more than one positive charge are labeled with Roman numerals in parentheses Cu Fe copper (I) ion copper (II) ion Cu2+ Fe2+ Fe3+ iron (II) ion iron (III) ion Older sysytem *In an older system of nomenclature, such ions are named by adding the suffixes –ous and –ic to a stem name of the element to indicate the ions of lower and higher charges, respectively. ferrous ion ferric ion cupric ion cuprous ion 1 ionic pounds 5 polyatomic ions polyatomic cations NH4+ ammonium 銨根 6 oxyanions (polyatomic anions containing oxygen) are named with ite or ate, for a lesser or greater quantity of oxygen. For example, is NO3? is If four oxyanions are possible, the prefixes hypo and per are used: ClO? ClO4? nitrite nitrate hypochlorite perchlorate NO2 7 The prefix bi is a deprecated way of indicating the presence of a single hydrogen ion NaHCO3 sodium bicarbonate sodium hydrogen carbonate The modern method specifically names the hydrogen atom. NaHCO3 ? Polyatomic ions: – NH4+ ammonium 銨
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