B2. Given the Name of the lonic Compound, Determine the Molecular Formula: Since lonic compounds are neutral compounds, the sum of the (+) and ( add to zero, One method to achieve this is the use the 1. Using the periodic table, write the symbol of the metal with its charge, ard the symbol of the nonmetal with its charge. 2. Apply Criss Cross/Reduce Method: Move the value of the charge (not the sign of the charge + or -) of the metal to the subscript of the nonmetal and the value of the charge of the nonmetal to the subscript of the metal as illustrated below: Example: Write the Formula for copper (II) fluoride 1. Write the symbol of each ion from the given name: copper (II) is Cu2+ fluoride is F- 2. CrissCross/Reduce: Take the value of 2 from Cu and put it as a subscript on F to make F2. Next, take the value of 1 from F and put as a subscript on Cu1. The Formula is then Cu1F2 Reducing is not required. Example: Write the Formula for: Potassium Phosphide 1. Symbols with Charges: K+P3 2. Criss Cross/Reduce: K3P (reducing not required) Example: Write the Formula for: manganese (IV) carbonate 1. Symbols with charges 2. Use Criss cross/Reduce: Mn4+ and CO32Mn2(CO3)4 and then reduce (is possible here) Mn(CO3)2 46. lead (II) oxide 47. cobalt (III) hydroxide 48. iron (II) carbonate 49. sodium sulfate 50. calcium phosphide 51. aluminum iodide 52. lead (II) nitride 53. aluminum nitride