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Ionic Compounds

This lesson focuses on the principles of writing formulas and naming ionic compounds that include transition metals. Students will learn how to determine the appropriate charge for the cation using Roman numerals and how to ensure that the overall charge of the compound is zero. Examples like Titanium(IV) Chloride and Iron(III) Sulfide illustrate the process of naming binary ionic compounds. The lesson also covers writing formulas for compounds involving polyatomic ions, emphasizing the importance of balancing charges to achieve neutral compounds.

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Ionic Compounds

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  1. Ionic Compounds Unit 6: Nomenclature - Part III Mrs. Callender

  2. Lesson Essential Questions: How do I write a formula for an ionic compound with a transition element? How do I name an ionic compound with a transition element?

  3. +4 -4 -1 = 0 Ex. TiCl4 The cation charge is what is used for the Roman Numeral in the name. Overall charge needs to be zero. What charge can Ti be to give a overall net zero charge? What is the charge of the nonmetal? Writing Names of Binary Ionic Compounds with a transition element Chloride Titanium (IV) 1. Write the Name of the first element (cation) as is. 2. Change the ending of the second element (anion) to –ide. Work backwards from the nonmetal to figure out what the charge of the cation is and that is the Roman Numeral that is used in the name.

  4. +6/2 +3 -2 = 0 +6 -6 Ex. Fe2S3 Overall charge needs to be zero. What charge can Fe be to give a overall net zero charge? BUT…..this time there are two iron atoms so the +6 charge needs to be divided equally therefore each Fe will have a +3 charge. Writing Names of Binary Ionic Compounds with a transition element Sulfide Iron (III) What is the charge of the nonmetal? BUT….there are three S atoms therefore the overall charge is -2(3) which is a -6. 1. Write the Name of the first element (cation) as is. The cation charge is what is used for the Roman Numeral in the name. 2. Change the ending of the second element (anion) to –ide. Work backwards from the nonmetal to figure out what the charge of the cation is and that is the Roman Numeral that is used in the name.

  5. -1 -2 = 0 +2 Ex. Ti(ClO4)2 Overall charge needs to be zero. What charge can Ti be to give a overall net zero charge? What is the charge of the anion? The cation charge is what is used for the Roman Numeral in the name. Writing Names of Polyatomic Ion Compounds with a transition element Titanium (II) Perchlorate 1. Write the Name of the first element (cation) as is. 2. Write the name of polyatomic ion remembering NOT to change the ending.. Work backwards from the anion to figure out what the charge of the cation is and that is the Roman Numeral that is used in the name.

  6. Writing Ionic Formulas containing transition elements. Ex. Copper (I) Chloride Write the formula for the anion and cation including the charges. The Cation gets its’ charge from the Roman Numeral. 2. Check to see if the charges are balanced. +1-1= Net charge of zero which means it is balanced. Cu+1 Cl-1 CuCl

  7. Writing Ionic Formulas Containing Transition Elements Ex. Mercury (II) Nitrate Write the formula for the anion and cation including the charges. Remember Cation gets its’ charge from the Roman Numeral. 2. Check to see if the charges are balanced. +2-1= Net charge of +1 which means it is NOT balanced and will need a subscript and parenthesis. Hg+2 NO3-1 Hg(NO3)2 2 Not Balanced

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