Part 2: Write Formulas for Ionic Compounds Formulas for ionic compounds do not s

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Part 2: Write Formulas for Ionic Compounds Formulas for ionic compounds do not show the exact number of ions, but rather the ratio of cations to anions. For example, the formula for sodium chloride, NaCl, shows that the ratio is 1 to 1. There are billions of ions in each crystal Use the information about monotomic ions and polyatomic ions provided in this document to answer the questions is this part. 11e 10e Loses an electron Na ion Na atom Gains an Cl atn CI ion Rules for Writing Formulas for Ionic Compounds 1. Determine the charge on the cation and anion. (a) The charge of common monatomic ions can be determined from the periodic table (Groups IA, IIA, A13+ only in Group IIIA, VA, VIA, VIIA) 1A 7A 8A 3A 4A SA A Li Na Mg Transition melals S CIL Br RbSr Te Cs+Ba2 Copyright2009 Pearson Prentice Hall, Inc. (b) Names of polyatomic ions are listed on a later page in this document. (c) Roman numerals in a name indicate the charge on the metal (preceding it) 2. Use subscripts to indicate the number of each ion needed in the formula to give an overall charge of zero 6. For the following compounds, write the cation and anion symbols, and then write the correct formula Name calcium fluoride potassium phosphate iron(II) sulfide calcium sulfate chromium(IV) oxide Cation (with charge) Anion (with charge) Formula magnesium oxide

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Answer:

Name Cation ( With charge) Anion ( With charge) Formula Calcium fluoride Ca+2 2 F- CaF2 potatssium phosphate 3 K+ PO43- K3PO4 iron (II) sulfide Fe+2 S-2 FeS calcium sulfate Ca+2 SO42- CaSO4 chromium (IV) oxide Cr+4 2 O-2 CrO2 magnesium oxide Mg+2 2 O-1 MgO2

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