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Name Date Class CHAPTER 7 STUDY GUIDE FOR CONTENT MASTERY Section 7.3 Chemical Formulas and Their Names In your textbook, read about communicating what is in a compound and naming ions and ionic compounds. Use each of the terms below just once to complete the passage. anion | -ate | cation | electrons | zero | lower right | monatomic | one | oxidation number | -ite | oxyanion | polyatomic | subscript | | | A one-atom ion is called a(n) (1) ion. The charge of such an ion is equal to the atom’s (2) , which is the number of (3) transferred to or from the atom to form the ion. In ionic compounds, the sum of the charges of all the ions equals (4) . Ions made up of more than one atom are called (5) ions. If such an ion is negatively charged and includes one or more oxygen atoms, it is called a(n) (6) . If two such ions can be formed that contain different numbers of oxygen atoms, the name for the ion with more oxygen atoms ends with the suffix (7) . The name for the ion with fewer oxygen atoms ends with (8) . In the chemical formula for any ionic compound, the chemical symbol for the (9) is written first, followed by the chemical symbol for the (10) . A(n) (11) is a small number used to represent the number of ions of a given element in a chemical formula. Such numbers are written to the (12) of the symbol for the element. If no number appears, the assumption is that the number equals (13) . For each formula in Column A, write the letter of the matching name in Column B. Column A Column B 2 14. ClO 4 15. ClO 16. ClO 17. Cl 18. ClO3 a. chlorate b. hypochlorite c. chloride d. perchlorate e. chlorite Copyright © Glencoe/McGraw-Hill, a division of the McGraw-Hill Companies, Inc. 46 Chemistry: Matter and Change • Chapter 8

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