1. 3.2 Names and Formulas of Ionic Compounds
INCREASING REACTIVITY
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2. Naming Simple Ionic Compounds
Rules for naming simple ionic compounds:
Write the name of the metal (positive ion) first.
Write the name of the non-metal (negative ion) second.
Change the ending of the non-metal ion to “ide.”
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3. Naming Simple Ionic Compounds
Examples:
Li3N __________________________
MgBr2 __________________________
Ag2O __________________________
CdS __________________________
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4. Naming Simple Ionic Compounds
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5. Writing Formulas for Simple Ionic Compounds
Rules for writing formulas for ionic compounds:
STEP ONE: Write the symbol for the more metallic element first. Then, write the symbol for the non-metallic element.
STEP TWO: Write the combining capacities for the elements. Ignore the + and – charges. *If there is no #, the combining capacity is 1.
STEP THREE: Swap and drop the combining capacities to get the subscripts.
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6. Writing Formulas for Simple Ionic Compounds
Examples:
Barium phosphide ______________
Aluminum nitride ______________
Zinc oxide ______________
Rubidium bromide ______________
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7. Multivalent Metal Compounds
Many metals are multivalent, meaning the metals form two or more different positive ions with different charges.
For example, the atom iron forms two ions Fe2+ and Fe3+.
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8. Multivalent Metal Compounds
To distinguish different ions for the same metal, roman numerals are added to their name. For example, Fe3+ would be named “iron(III)”
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9. Writing Formulas for Ionic Compounds Containing Multivalent Metals
It is easy to write the formulas for multivalent ionic compounds, because they tell you their combining capacities so you don’t need to look on the periodic table.
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See page 89

10. Writing Formulas for Ionic Compounds Containing Multivalent Metals
Examples:
Iron (II) phosphide ______________
Manganese (II) oxide ______________
Tin (II) sulfide ______________
Lead (IV) chloride ______________
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11. Naming Ionic Compounds Containing Multivalent Metals
It is a little more difficult to name a multivalent ionic compound, because you have to work backwards to figure out which combining capacity was used. Remember to use a ROMAN NUMERAL!!!
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12. Naming Ionic Compounds Containing Multivalent Metals
Examples:
Fe2O3 __________________________
PbF4 __________________________
MnS __________________________
TiS2 __________________________
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13. Naming Ionic Compounds Containing Polyatomic Ions
When you are naming compounds with more than two elements, you are dealing with a polyatomic ion. All you need to do, is find it in the chart so you can name your compound.
If the polyatomic ion group has a positive charge (+) it acts like a metal and comes first in the name.
If the polyatomic ion group has a negative charge (-) it acts like a non-metal and comes second in the name.
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14. Naming Ionic Compounds Containing Polyatomic Ions
Examples:
Fe(OH)3 ________________________
Mg3(PO4)2 ________________________
(NH4)3P ________________________
Ca(CH3COO)2 ________________________
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15. Writing Formulas for Ionic Compounds Containing Polyatomic Ions
Each polyatomic ion has its own combining capacity that should be used when writing a chemical formula.
USE BRACKETS AROUND THE POLYATOMIC IONS!!
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16. Writing Formulas for Ionic Compounds Containing Polyatomic Ions
Examples:
Sodium chromate ________________
Ammonium nitrate ________________
Lead (II) perchlorate ________________
Tin (II) cyanide ________________
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Section 3.2 Quiz
See page 91