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## Writing Chemical Formulas and Naming Compounds

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**Vanadium (III) peroxide**write a correct formula**Write the Correct Formula**V3+ O22- V2(O2)3 2 3 Crisscross and use parentheses for the more than one polyatomic ions, but NOT for the monatomic ion**Cadmium phosphide**write a correct formula**Write the Correct Formula**Cd2+ P3- Cd3P2 3 2 Crisscross and NO parentheses because there are NO polyatomic ions**Chromium (III) chloride**write a correct formula**Write the Correct Formula**Cr3+Cl- CrCl3 1 3 Crisscross and NO parentheses because there are NO polyatomic ions**Ammonium dichromate**write a correct formula**Write the Correct Formula**NH4+ Cr2O72- (NH4)2Cr2O7 2 1 Crisscross and use parentheses for the more than one polyatomic ions, but NOT for the single polyatomic ion**Aluminum arsenate**write a correct formula**Write the Correct Formula**Al3+ AsO43- AlAsO4 No need to crisscross because the charges are balanced; NO parentheses for monatomic and single polyatomic ions**Magnesium sulfide**write a correct formula**Write the Correct Formula**Mg2+ S2- MgS No need to crisscross because the charges are balanced; NO parentheses for the monatomic ions**Iron (II) acetate**write a correct formula**Write the Correct Formula**Fe2+ CH3COO- Fe(CH3COO)2 1 2 Crisscross and use parentheses for the more than one polyatomic ions, but NOT for the monatomic ion**Ammonium chromate**write a correct formula**Write the Correct Formula**NH4+ CrO42- (NH4)2CrO4 2 1 Crisscross and use parentheses for the more than one polyatomic ions, but NOT for the single polyatomic ion**Zinc hydrogensulfate**write a correct formula**Write the Correct Formula**Zn2+ HSO4- Zn(HSO4)2 1 2 Crisscross and use parentheses for the more than one polyatomic ions, but NOT for the monatomic ion**Tin (IV) hypochlorite**write a correct formula**Write the Correct Formula**Sn4+ClO- Sn(ClO)4 1 4 Crisscross and use parentheses for the more than one polyatomic ions, but NOT for the monatomic ion**Lead (IV) sulfate**write a correct formula**Write the Correct Formula**Pb4+ SO42- Pb(SO4)2 2 4 Crisscross, SIMPLIFY, and use parentheses for the more than one polyatomic ions, but NOT for the monatomic ion**Copper (II) dihydrogenphosphate**write a correct formula**Write the Correct Formula**Cu2+ H2PO4- Cu(H2PO4)2 1 2 Crisscross and use parentheses for the more than one polyatomic ions, but NOT for the monatomic ion**Barium permanganate**write a correct formula**Write the Correct Formula**Ba2+ MnO4- Ba(MnO4)2 1 2 Crisscross and use parentheses for the more than one polyatomic ions, but NOT for the monatomic ion**Calcium chlorate**write a correct formula**Write the Correct Formula**Ca2+ ClO3- Ca(ClO3)2 1 2 Crisscross and use parentheses for the more than one polyatomic ions, but NOT for the monatomic ion**Ammonium oxide**write a correct formula**Write the Correct Formula**NH4+ O2- (NH4)2O 2 1 Crisscross and use parentheses for the more than one polyatomic ions, but NOT for the monatomic ion**Silver chlorite**write a correct formula**Write the Correct Formula**Ag+ ClO2- AgClO2 No need to crisscross because the charges are balanced; NO parentheses for monatomic and single polyatomic ions**Mercury (II) iodide**write a correct formula**Write the Correct Formula**Hg2+I- Hgl2 1 2 Crisscross and NO parentheses because there are NO polyatomic ions**Beryllium carbonate**write a correct formula**Write the Correct Formula**Be2+ CO32- BeCO3 No need to crisscross because the charges are balanced; NO parentheses for monatomic and single polyatomic ions**Sodium phosphate**write a correct formula**Write the Correct Formula**Na+ PO43- Na3PO4 3 1 Crisscross and NO parentheses for monatomic and single polyatomic ions**Iron (III) bromide**write a correct formula**Write the Correct Formula**Fe3+ Br- FeBr3 1 3 Crisscross and NO parentheses because there are NO polyatomic ions**Potassium nitrate**write a correct formula**Write the Correct Formula**K+ NO3- KNO3 No need to crisscross because the charges are balanced; NO parentheses for monatomic and single polyatomic ions**Lithium nitride**write a correct formula**Write the Correct Formula**Li+ N3- Li3N 3 1 Crisscross and NO parentheses because there are NO polyatomic ions**Lead (II) hydroxide**write a correct formula**Write the Correct Formula**Pb2+ OH- Pb(OH)2 1 2 Crisscross and use parentheses for the more than one polyatomic ions, but NOT for the monatomic ion**Niobium (V) perchlorate**write a correct formula**Write the Correct Formula**Nb5+ ClO4- Nb(ClO4)5 1 5 Crisscross and use parentheses for the more than one polyatomic ions, but NOT for the monatomic ion**Cobalt (III) hydrogenphosphate**write a correct formula