1. Naming & Writing Ionic Formulas

2. Learning Goal To recall our knowledge about ionic bonds
To learn how to name them!

3. Ionic Bonding
When an atom has only a few electrons in this outermost shell, (like Sodium and Magnesium) it is part of the METALS family in the periodic table
Metals like to GIVE AWAY their electrons in order to be Happy
Remember: It is easier to give away 1 or 2 electrons than it is to try and get 6 or 7 more!
An IONIC BOND happens when a METAL gives away its electron(s) to a NON- METAL

4. Ionic Bonding: Example

5. Naming Ionic Compounds with Two Elements
To name a compound that contains two elements,
identify the cation and anion.
Name the cation first followed by the name of the anion.

6. Charges of Representative Elements

7. Names of Some Common Ions

9. Learning Check - CRisscross
Write the formulas and names for compounds of the following ions:
Br− S2− N3−
Na+
Al3+

10. Solution - Crisscross Na+ Al3+ NaBr sodium bromide Na2S sodium sulfide
Br− S2− N3−
Na+
Al3+
NaBr
sodium bromide
Na2S
sodium sulfide
Na3N
sodium nitride
AlBr3
aluminum bromide
Al2S3
aluminum sulfide
AlN
aluminum nitride

11. Recall: IONIC COMPOUNDS
A formula unit is the lowest whole number ratio of ions in an ionic compound
i.e. Mg2O2 -> MgO

12. NAMING COMPOUNDS
Your ability to name compounds and write formula’s hinges on your ability to recognize whether a compound is made up of a metal + non-metal or just 2 non-metals

13. BINARY IONIC COMPOUNDS
Binary means 2 elements
Ionic means a metal and a non-metal (or cation and anion)
Writing Formulas
• charges must balance so
compound charge is neutral.

15. BINARY IONIC COMPOUNDS
Writing Formulas from Names
• 1st word = CATION
• 2nd word = ANION name
with ide ending.

16. BINARY IONIC COMPOUNDS
NaBr
MgF2
Sodium Bromide
Magnesium Fluoride

17. BINARY IONIC COMPOUNDS
Potassium Chloride
Aluminum Oxide
• notice ending of name is ide!
K+Cl- -> KCl
Al3+O2- -> Al2O3

18. Transition Metals form Positive Ions
Most transition metals and Group 4(14) metals form 2 or more positive ions.
Zn2+, Ag+, and Cd2+ form only one ion.

19. Metals that form more than One Cation
The name of metals with two or more positive ions
(cations) use a Roman numeral to identify ionic charge.
Lead Pb lead(II)
Pb lead(IV)

20. Naming Ionic Compounds with Variable Charge Metals

21. Naming Variable Charge Metals
Transition metals with two different ions use a Roman numeral after the name of the metal to indicate ionic charge.

22. Naming FeCl2 To name FeCl2
1. Determine the charge of the cation using the charge
of the anion (Cl-).
Fe ion Cl- = Fe ion = 0
Fe ion = 2+
2. Name the cation by the element name and add a
Roman numeral in parenthesis to show its charge.
Fe2+ = iron(II)
3. Write the anion with an ide ending.
FeCl2 = iron (II) chloride

23. Naming Cr2O3
To name Cr2O3
1. Determine the charge of cation from the anion (O2-).
2 Cr ions O2- = 0
2 Cr ions (2-) = 0
2 Cr ions = 0
2 Cr ions = +6
Cr ion = = Cr3+
2. Name the cation by the element name and add a
Roman numeral in parenthesis to show its charge.
Cr3+ = chromium (III)
3. Write the anion with an ide ending.
chromium(III) oxide = Cr2O3

24. Learning Check Select the correct name for each. A. Fe2S3
1) iron sulfide
2) iron(II) sulfide
3) iron(III) sulfide
B. CuO
1) copper oxide
2) copper(I) oxide
3) copper(II) oxide

25. Solution Select the correct name for each. A. Fe2S3
3) iron (III) sulfide Fe3+ S2-
B. CuO
3) copper (II) oxide Cu2+ O2-