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Ionic Compounds Writing Formulas

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**Ionic Compounds Metal + Nonmetal Can have a polyatomic ion**

Cation is first Anion is second TOTAL charge has to be zero!

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**Transition Metals Can form different ions**

Ion charge is indicated with romal numerals after the element’s name Example: copper(I) has a +1 charge

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**Steps for Writing Formulas**

Several examples will follow this slide! Write out the two parts that will be in the compound. Look up the charge and write it as a superscript for each part. Cross the numbers (no signs). Reduce the formula to the lowest numbers.

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Example 1 What is the formula for the ionic compound made from sodium and fluorine?

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**1. Write out the two parts that will be in the compound.**

Na F What is the formula for the ionic compound made from sodium and fluorine?

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**2. Look up the charge and write it as a superscript for each part.**

- Na + F What is the formula for the ionic compound made from sodium and fluorine?

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**3. Cross the numbers (no signs).**

- Na + F 1 1 What is the formula for the ionic compound made from sodium and fluorine?

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4. Reduce the numbers. Na F 1 1 What is the formula for the ionic compound made from sodium and fluorine?

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**5. Rewrite as a finished formula.**

Na F What is the formula for the ionic compound made from sodium and fluorine?

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Wrap-Up 1 What is the formula for a compound made from lithium and bromine? LiBr

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Example 2 What is the formula for the ionic compound made from aluminum and iodine?

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**1. Write out the two parts that will be in the compound.**

Al I What is the formula for the ionic compound made from aluminum and iodine?

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**2. Look up the charge and write it as a superscript for each part.**

- Al 3+ I What is the formula for the ionic compound made from aluminum and iodine?

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**3. Cross the numbers (no signs).**

- Al 3+ I 1 3 What is the formula for the ionic compound made from aluminum and iodine?

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4. Reduce the numbers. Al I 1 3 What is the formula for the ionic compound made from aluminum and iodine?

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**5. Rewrite as a finished formula.**

AlI 3 What is the formula for the ionic compound made from aluminum and iodine?

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Wrap-Up 2 What is the formula for a compound made from beryllium and chlorine? BeCl2

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Example 3 What is the formula for the ionic compound made from potassium and nitrogen?

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**1. Write out the two parts that will be in the compound.**

K N What is the formula for the ionic compound made from potassium and nitrogen?

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**2. Look up the charge and write it as a superscript for each part.**

+ 3- K N What is the formula for the ionic compound made from potassium and nitrogen?

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**3. Cross the numbers (no signs).**

3- K + N 3 1 What is the formula for the ionic compound made from potassium and nitrogen?

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4. Reduce the numbers. K N 3 1 What is the formula for the ionic compound made from potassium and nitrogen?

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**5. Rewrite as a finished formula.**

K3N What is the formula for the ionic compound made from potassium and nitrogen?

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Wrap-Up 3 What is the formula for a compound made from cesium and sulfur? Cs2S

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Example 4 What is the formula for the ionic compound made from magnesium and selenium?

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**1. Write out the two parts that will be in the compound.**

Mg Se What is the formula for the ionic compound made from magnesium and selenium?

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**2. Look up the charge and write it as a superscript for each part.**

2- 2+ Mg Se What is the formula for the ionic compound made from magnesium and selenium?

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**3. Cross the numbers (no signs).**

2- Mg 2+ Se 2 2 What is the formula for the ionic compound made from magnesium and selenium?

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**Mg Se 4. Reduce the numbers. 2 2**

What is the formula for the ionic compound made from magnesium and selenium?

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**5. Rewrite as a finished formula.**

MgSe What is the formula for the ionic compound made from magnesium and selenium?

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Wrap-Up 4 What is the formula for a compound made from indium and arsenic? InAs

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Example 5 What is the formula for the ionic compound made from iron(III) and oxygen?

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**1. Write out the two parts that will be in the compound.**

Fe O What is the formula for the ionic compound made from iron(III) and oxygen?

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**2. Look up the charge and write it as a superscript for each part.**

2- O Fe 3+ What is the formula for the ionic compound made from iron(III) and oxygen?

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**3. Cross the numbers (no signs).**

2- Fe 3+ O 2 3 What is the formula for the ionic compound made from iron(III) and oxygen?

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4. Reduce the numbers. Fe O 2 3 What is the formula for the ionic compound made from iron(III) and oxygen?

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**5. Rewrite as a finished formula.**

Fe2O3

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Wrap-Up 5 What is the formula for a compound made from lead(IV) and sulfur? PbS2

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Example 6 What is the formula for the ionic compound made from sodium and phosphate?

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**1. Write out the two parts that will be in the compound.**

Na PO4 What is the formula for the ionic compound made from sodium and phosphate?

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**2. Look up the charge and write it as a superscript for each part.**

3- + Na PO4 What is the formula for the ionic compound made from sodium and phosphate?

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**3. Cross the numbers (no signs).**

3- + Na PO4 3 1 What is the formula for the ionic compound made from sodium and phosphate?

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**PO4 Na 4. Reduce the numbers. 3 1**

What is the formula for the ionic compound made from sodium and phosphate?

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**5. Rewrite as a finished formula.**

Na3PO4

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Wrap-Up 6 What is the formula for a compound made from cesium and sulfite? Cs2SO3

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Example 7 What is the formula for the ionic compound made from chromium(III) and nitrate?

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**1. Write out the two parts that will be in the compound.**

Cr NO3 What is the formula for the ionic compound made from chromium(III) and nitrate?

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**2. Look up the charge and write it as a superscript for each part.**

3+ - Cr NO3 What is the formula for the ionic compound made from chromium(III) and nitrate?

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**3. Cross the numbers (no signs).**

3+ - Cr NO3 1 3 What is the formula for the ionic compound made from chromium(III) and nitrate?

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**Cr (NO3) 4. Reduce the numbers. 1 3**

If the number by the polyatomic ion can’t reduce, draw parentheses around the ion’s formula What is the formula for the ionic compound made from chromium(III) and nitrate?

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**5. Rewrite as a finished formula.**

Cr(NO3)3 What is the formula for the ionic compound made from chromium(III) and nitrate?

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Wrap-Up 7 What is the formula for a compound made from ammonium and sulfur? (NH4)2S

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