Lesson 2.4 - Naming Ionic Bonds

Lesson 2.4 - Naming Ionic Bonds

             Learning Intention: 

What? We are learning  how to write the names and chemical formulas for ionic bonds. 

Why?  In order to  use the International Union of Pure and Applied Chemistry (IUPAC) nomenclature correctly. 

             Success Criteria

I can: 

- Identify the properties of ionic bonds.

-Develop formulas for ionic bonds

- Identify the IUPAC nomenclature for ionic bonds when given an ionic compound formula. 

The International Union of Pure and Applied Chemistry (IUPAC)

The world authority on chemical nomenclature and terminology, including the naming of new elements in the periodic table; on standardized methods for measurement; and on atomic weights, and many other critically-evaluated data.

Naming Ionic Bonds: 

Formula

Name of Ionic Compound

AlCl

3

Naming Ionic Bonds: 

Formula

Name of Ionic Compound

AlCl

3

Aluminum chloride 

1st element: stays the same name

2nd element:  

    -  becomes lower case

    -  add "-ide" suffix means negative

    - Subscripts not needed in Name

Example:

Write the IUPAC nomenclature for K  P

3

Example:

Write the IUPAC nomenclature for K  P

3

K = Potassium

p = Phosphorus

Potassium phosphorus

ide

Potassium Phosphide

  Writing Formulas for Ionic Compounds

Magnesium     nitride

(when given the name)

  Writing Formulas for Ionic Compounds

SHORT CUT

Magnesium     nitride

(when given the name)

1. Write the Symbols
2. Write the Ion Charges
3. Cross over the charges .
4. Remove the charge SIGNS
5. Simplify if possible.

Mg                            N

2+

Mg

Mg

N

N

3-

 3-

2+

Mg   N

3

2

       Why does the Criss Cross / Drop & Swap Work 

Magnesium     nitride  nitrogen

Magnesium     Nitrogen 

      Mg                  N   

        Mg                N

   

                

Cation-Metal

Anion-Nonmetal

2+                

3-

2

3

2

Mg   N

3

What does this REALLY mean? 

3 Mg     = +6 

2 N        = -6

 Charges cancel 

2+                

3-

You Try

          Magnesium Iodide   

              Naming Ionic Bonds:

             Name  

Magnesium Iodide   

 Formula

MgI

3

Subscript:  small number written at the bottom right of the element symbol. Tells the number of atoms in the compound(molecule).

Combining Element Symbols in a Compound: 

1st letter of a symbol is Upper case. 2nd letter of a symbol is Lower Case.

Example:

What is the formula for the compound that forms between magnesium and phosphorous?

                                                   

Example:

What is the formula for the compound that forms between magnesium and phosphorous?

                                                   Mg      P   

                                               Mg      P

                                                Mg     P

2+

3-

To form a compound with NO charge, 

3 Mg    is needed = +6

2 P       is needed = -6

                                

+2

-3

3

2

symbol

charges

criss cross

drop 

charges