What is the formula for mercury(I) chloride? |
The formula for mercury(I) chloride is Hg2Cl2. Unlike other transition metals, the 1+ cation of mercury has the formula Hg22+ and behaves like a polyatomic ion. |

What is the formula for mercury(II) nitride? |
The formula for mercury(II) nitride is Hg3N2. Mercury has a 2+ charge, as indicated by the roman numeral, and nitride has a 3- charge. Three mercury ions and two nitride ions are needed to balance the charges between the cation and anion. |

What is the name for the compound with the formula SnCl4? |
Tin(IV) chloride is the name for the compound with the formula SnCl4. The roman numeral must be included in the name because tin has two possible charges, 2+ and 4+. The formula has four chloride ions, each with a 1- charge, so the charge on tin must be 4+ to balance the charges between the cation and anions. |

What is the name for the compound with the formula Sc(ClO4)3? |
Scandium perchlorate is the name for the compound with the formula Sc(ClO4)3. A roman numeral is not included in the name because scandium has only one possible charge, 3+. |

What is the name for the compound with the formula Sn(CrO4)2? |
Tin(IV) chromate is the name for the compound with the formula Sn(CrO4)2. With two chromate ions, each with a 2- charge, the charge on tin must be 4+ to balance the charges between the cation and anion. Tin cations can have a 2+ or 4+ charge, so a roman numeral must be included in the name. |

What is the name for the compound with the formula SnSO4? |
The name for the compound with the formula SnSO4 is tin(II) sulfate. Sulfate has a 2- charge. The magnitude of the charge on tin must match that of sulfate since the formula includes one tin ion and one sulfate ion. Tin has two possible charges, 2+ and 4+, so a roman numeral must be used in the name to indicate which one. |

How many chromium ions are in the compound chromium(II) nitrate? |
In chromium(II) nitrate, there is one chromium ion in the formula. Chromium has a 2+ charge and nitrate has a 1- charge, so one chromium ion and two nitrate ions are in the formula to create a balance between the charges of the cation and the anion. |

What is the formula for chromium(II) hydroxide? |
Chromium(II) hydroxide has the formula Cr(OH)2. Chromium has a 2+ charge and the hydroxide ion has a 1- charge, so two anions are needed to balance the charge of the cation. |

How many chloride ions will be found in the formula for cobalt(II) chloride? |
The formula for cobalt(II) chloride is CoCl2 so there are 2 chloride ions in the compound. Cobalt has a 2+ charge, so two chloride ions, each with a 1- charge, are needed to balance the cation’s charge. |

What is the copper-to-sulfate ratio in copper(I) sulfate? |
The formula for copper(I) sulfate is Cu2SO4, so the copper-to-sulfate ratio is 2:1. The sulfate has a 2- charge, so two Cu+ ions are needed to balance the charge. |

What is the name for Pb(SO3)2? |
The name for the compound with the formula Pb(SO3)2 is lead(IV) sulfite. Since there are two sulfite ions, each with a 2- charge, the charge on lead must be 4+. Lead can have a 2+ or 4+ charge, so a roman numeral is needed to indicate the charge on the cation. |

What is the formula for the compound iron(II) phosphite? |
Iron(II) phosphite has the formula Fe3(PO3)2. The roman numeral in the name indicates that the iron has a 2+ charge. Phosphite has a 3- charge (PO33-). Three iron cations and two phosphite ions in the compound balance the charges between the cation and anion. |

What is the name for the compound with the formula CoP? |
The name for the compound with the formula CoP is cobalt(III) phosphide. Cobalt has two possible charges, 2+ and 3+, so a roman numeral should be included in the name to represent the charge of the cation in this compound. |

What is the charge on the cobalt ion in CoBr2? |
The cobalt in CoBr2 has a charge of 2+. Cobalt is a transition metal, so it forms a cation with a positive charge. The bromide ion has a 1- charge, so if two are needed to balance the charge of the cobalt, then cobalt must have a 2+ charge. |

What is the name for the compound with the formula PbF2? |
The name for the compound with the formula PbF2 is lead(II) fluoride. Lead cations can have more than one charge (2+ or 4+), so a roman numeral should be included in the name. Fluoride has a 1- charge and if two anions are needed to balance the charge on the lead cation, then it must have a 2+ charge. |

Which one of the following correctly pairs a formula with its name? |
Zinc dichromate has the formula ZnCr2O7. Zinc chloride would have the formula ZnCl2. Zinc has only one possible charge (2+), so roman numerals are not needed in the name for zinc compounds. |

What is the formula for chromium(III) sulfide? |
The formula for chromium(III) sulfide is Cr2S3. Chromium has a 3+ charge as indicated by the roman numeral in the name. Sulfide anions have a 2- charge. To balance the charges between the cations and anions, two chromium ions and three sulfide ions are needed. |

What is the formula for cobalt(III) chlorate? |
The formula for cobalt(III) chlorate is Co(ClO3)3. Cobalt has a 3+ charge, so three chlorate anions (ClO3¯) are needed to balance the charge of the cobalt. |

What is the formula for copper(I) nitride? |
Copper(I) nitride has the formula Cu3N. Since copper has a 1+ charge and the nitride anion has a 3- charge, three copper ions are needed to balance the charge of the nitride ion. |

What is the charge on the silver ion in AgMnO4? |
The charge on the silver ion in AgMnO4 is 1+ because it has only one possible charge, 1+. The permanganate ion, MnO4¯, has a 1- charge, so a compound with a 1:1 ratio will have the same magnitude of charge on both ions. The cation is written first in the formula and in the name. |

What is the formula for the compound lead(II) cyanide? |
Lead(II) cyanide has the formula Pb(CN)2. The cyanide ion has a 1- charge, and if two anions are needed to balance the charge from the cation, then lead must have a 2+ charge. The roman numeral in the compound’s name indicates the charge on the lead cation. |

What is the formula for zinc iodide? |
Zinc iodide has the formula ZnI2 because zinc has a 2+ charge and iodide has a 1- charge. Therefore, two iodide ions are needed to balance the charge of the zinc cation. A roman numeral is not needed in the name because zinc only has one possible charge. |

What is the charge on the copper ion in the compound CuF2? |
The copper ion in CuF2 has a 2+ charge. The compound has two fluoride ions, each with a 1- charge; therefore copper must have a 2+ charge to balance the charges between the cation and anion. |

Which one of the following correctly pairs a formula with its name? |
Cr(OH)3 is the formula for chromium(III) hydroxide. AgOH is silver hydroxide. Silver has only one possible charge, 1+, so a roman numeral should not be included in the name. |

What is the name for the compound Ag2CO3? |
The name for the compound with the formula Ag2CO3 is silver carbonate. Silver has only one possible charge (1+), so no roman numeral should be used in the name. |

What is the charge on the iron ion in Fe2S3? |
The iron cation in Fe2S3 has a 3+ charge. Based on the formula, there are two iron cations and three sulfide ions. Each sulfide ion has a 2- charge, so if there are three sulfide ions, the two iron cations must have a total charge of 6+ or 3+ on each cation. |

What are the charges on the copper and phosphide ions, respectively, in copper(II) phosphide? |
In copper(II) phosphide, the copper ion has a 2+ charge and the phosphide ion has a 3- charge. The cation is listed first in the name for the compound so the copper must have a positive charge. The roman numeral listed after copper indicates that the copper will have a 2+ charge. |

What is the name for the compound with the formula FeO? |
Iron(II) oxide is the name for the compound with the formula FeO. Since iron is a transition metal and can have multiple charges (2+ and 3+), the roman numeral is needed to indicate its charge. The formula has a 1:1 ratio between the cation and anion, so the charge on the iron must be the same magnitude, but the opposite sign, for the oxide anion (2-). |

What is the formula for the compound iron(III) sulfite? |
The formula for iron(III) sulfite is Fe2(SO3)3. As indicated by the roman numeral, iron has a charge of 3+. Sulfite has a 2- charge, requiring three sulfite ions and two iron ions to create a balance of charges between the cation and anions. |

# Transition Metals with Polyatomic Ions

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