Binary Ionic Compounds

Ionic Compounds:

*They are Ionic (Nonmetal and Metal)

*Electrons are transferred between atoms.

How To Name a Binary Ionic Compound:

1. Name the first element: EX: NaF---> Sodium __?__

2. Name the second element, drop the last syllable and end in -ide EX: NaF ---> Sodium Fluoride

3. DO NOT USE PREFIXES!!

Examples:

1. Sr2O --- Strontium Oxide 4. Ag2O --- Silver Oxide

2. NaF --- Sodium Fluoride 5. MgS --- Magnesium Sulfide

3. BaCl2 --- Barium Chloride

How To Write a Formula:

1.Write the symbols for each element. (You might have to use a periodic table of elements)

2. Locate the oxidation number for each element found in the periodic table.

3. Make sure that the oxidation numbers equal zero. You might have to adjust the oxidation number until you get them to equal ZERO! This involves adding elements...

EXAMPLE: Magnesium Bromide -------------------> Mg+2 Br-1 ----> (+2) + (-1) = 1 NOT ZERO!

Oxidation Numbers

Add another element. For this example, we are going to add another Bromide. YOU CAN ONLY ADD AN ELEMENT GIVEN IN THE PROBLEM.

Mg+2 (Br-1 + Br-1)

Mg+2 Br-2 ---> (+2) + (-2) = 0

You always want

to end with a zero.

Mg2Br-2

**MgBr**

Simplify if both number can be simplified. Remember that the 1 is understood.

Transition Metals:

Compounds are named a little bit different than the others. They require some special rules that can be a little confusing specially if it has a transition metal. The transition metals can have more than one oxidation number.

Is the element a transition metal?

Yes No

Include ROMAN Write Name Rules:

Numerals with -----> *Name first element

- *Name second element and end with -ide

Uncross #'s and check if the second elements (nonmetal) charge matches the charge number on the Periodic Table.

VIDEO CREATED BY: Emile Frey, Physical Science/STEM Teacher

How To Name a Transition Metal Compound:

Writing the Formulas:

You write the formulas by using the charges they give you in Roman Numerals. (I, II, III, IV, V...). The first charge (top number) is always positive and the second is always negative.

STEPS:

1. For Example: Nickel (III) Oxide------N+3 O-2

*The positive charge for Nickel is 3 because that was what it said (III).

*The charge for the Oxygen is brought from the periodic table.

2. The second step is to cross the numbers. (Change the 3 to the Oxygen and the 2 to the Nickel. (Forget the signs.---------------------------------------------N2 O3....This is the final answer since you cannot reduce.

Examples:

1. Nickel (II) Oxide--NiO because Ni+2 O-2-----Ni2O2---REDUCE BY 1----NiO

2. Lead (IV) Oxide----PBO2

3. Manganese (II) Bromide----MnBr2

STEPS:

Naming Formulas:

When you are naming formulas, you simply uncross the numbers and change the sub-numbers to charges.

STEPS:

1. List the numbers that you see or are understood Ex. CuCl2---Cu1 Cl2

2. Uncross the numbers to change them into charges. Cu+2 Cl-1

3. The only way to find out if you have it right is to check the charge of the socond element to the charge on the periodic table. If they match, you have written the correct name.

4. Based on the P.T., the charge is correct so we name it Copper (II) Chloride....The charge of the first element always goes in ROMAN NUMERALS.

Examples:

1. CuBr---Copper (I) Bromide Because Cu1 Br1---Cu+1 Br-1 (Check P.T.) so 1 is the roman

numeral.

2. Co2S3----Cobalt (III) Sulfide

3. FeO---Iron (II) Oxide

Take a Quiz!

After the confusing notes, are you able to ACE the quiz. Even if you just watched the video lesson, try out and see how much you can do! You can then brag about your certificate!

Quiz!