Representing the charge on the manganese ion the

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representing the charge on the manganese ion, the charge on the manganese cation can be figured out as follows: total cation charge + total anion charge = 0 x + ( 2) = 0 x = + 2 Each manganese cation must therefore be + 2 to balance the 2 of the oxide to yield an uncharged ionic formula. The systematic name for Mn 2 + is manganese(II) . Monatomic anions are named with the root of the nonmetal followed by –ide, so O 2 is oxide . MnO is named manganese(II) oxide. Example 3.8 provides other examples. Type of cation General name Example metal with one possible charge (groups 1, 2, 3–Al, Zn, and Cd) name of metal Mg 2 + is magnesium. metal with more than one possible charge (the rest of the metallic elements) name of metal (Roman numeral) Cu 2 + is copper(II). polyatomic cations (for us, only ammonium) name of polyatomic cation NH 4 + is ammonium. Table 3.7 Summary of the Ways Cations Are Named O BJECTIVE 37 Type of anion General name Example monatomic anions (root of nonmetal)ide O 2 is oxide. polyatomic anions name of polyatomic anion NO 3 is nitrate. Table 3.8 Summary of the Ways Anions Are Named O BJECTIVE 37
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E XAMPLE 3.8 - N AMING I ONIC C OMPOUNDS Write the names that correspond to the following formulas: (a) MgO (used to make aircraft windshields), (b) CoCl 2 (used to manufacture vitamin B‑12), (c) NH 4 NO 3 (used to make explosives), and (d) Fe 2 O 3 (in paint pigments). Solution a. The compound MgO includes the cation Mg 2 + and the anion O 2 . Magnesium cations are always + 2, so the name of the cation is the same as the name of the metallic element. The anion O 2 is monatomic, so it is named by combining the root of the name of the nonmetal with ‑ide. Therefore, MgO is magnesium oxide . b. Cobalt is not on our list of metallic elements that form ions with only one charge, so we assume it can form ions with more than one possible charge. Therefore, we need to show the charge on the cobalt ion with a Roman numeral in parentheses after the name cobalt. The cobalt ion must be + 2 to balance the 2 from the two 1 chloride ions. Total cation charge + total anion charge = 0 x + 2( 1) = 0 x = + 2 The anion Cl is monatomic, so its name includes the root of the name of the nonmetal and ‑ide. Therefore, CoCl 2 is cobalt(II) chloride . c. The compound NH 4 NO 3 includes the cation NH 4 + and the anion NO 3 . Both of these ions are polyatomic ions with names you should memorize. The name of NH 4 NO 3 is ammonium nitrate . d. Iron is not on our list of metallic elements that form ions with only one charge, so we need to show the charge on the iron ion with a Roman numeral. Because oxygen atoms have two fewer electrons than the nearest noble gas, neon, they form 2 ions. In the following equation, x represents the charge on each iron ion. Because there are two iron ions, 2 x represents the total cation charge.
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  • Fall '06
  • Mark
  • Atom, atoms, Chemical bond

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