1. NAMING Ionic COMPOUNDS Jenny Casares Xandra Garanzuay

2. IONIC BONDING Opposites Attract
Metal Nonmetal
Cation Anion
Ex. NaCl MgBr2
metal-nonmetal metal-nonmetal + -

3. Binary Compounds Example: aluminum oxide
1. Write cation symbol first, then anion.
aluminum oxide
Al O2-

4. Binary Compounds Example: aluminum oxide
2. Compare value of charges.
Al O2-

5. Binary Compounds Example: aluminum oxide
2. Compare value of charges.
Al O2-
Two (2) aluminum ions are needed to balance out three (3) oxide ions.
Al3+ Al3+ O2- O2- O2-
+3 x 2 = and x 3 = -6
Charges cancel, or +6 – 6 = 0, Neutral!

6. Binary Compounds Example: aluminum oxide
3. Check subscripts for smallest whole number ratio:
Formula is: Al2O3
(cannot be reduced further)

7. Stock System Some metals are multivalent, having more than one cation.
Example:
iron(II) iron(III)
Fe Fe3+

8. Stock System
To distinguish different ionic charges, Roman numerals are used.
Example:
iron(II) iron(III)
Fe Fe3+
II= III=+3

9. Stock System Example: iron(II)oxide
1. Write cation symbol first, then anion.
iron(II) oxide
Fe O2-

10. Stock System Example: iron(II)oxide
2. Compare value of charges.
Fe O2-
One (1) iron ion is needed to balance out one (1) oxide ion.
+2 x 1 = and x 1 = -2

11. Stock System Example: iron(II)oxide
3. Check subscripts for smallest whole number ratio:
Formula: FeO

12. Let’s practice! 1. Write cation first, then anion. 2. Compare charges.
3. Check subscripts for smallest whole number ratio.

13. IONIC BONDING Opposites Attract
Polyatomic Ion – Polyatomic Ion
Cation – Anion
Ex. NaOH (NH4)2CO3
metal-polyatomic polyatomic-polyatomic + -

14. Polyatomic Compounds Example: ammonium carbonate
1. Write cation symbol first, then anion.
ammonium carbonate
NH CO32-

15. Polyatomic Compounds Example: ammonium carbonate
2. Compare value of charges.
NH CO32-

16. Polyatomic Compounds Example: ammonium carbonate
2. Compare value of charges.
NH CO32-
Two (2) ammonium ions are needed to balance out one (1) carbonate ion.
NH4+ NH4+ CO32-
+1 x 2 = and x 1 = -2
Charges cancel, or +2 – 2 = 0, Balanced!

17. Polyatomic Compounds Example: ammonium carbonate
3. Use “( )” around polyatomic ions when there is more than one. Check subscripts for smallest whole number ratio.
Formula is: (NH4)2CO3
*Polyatomic ions are a bonded unit and cannot be separated or reduced.
* A “1” subscript is understood and not written.

18. Let’s practice! 1. Write cation first, then anion. 2. Compare charges.
3. Check subscripts for smallest whole number ratio.

19. COVALENT BONDING Cooperative Bonding
Before you can name correctly, you must be able to distinguish between an ionic and a covalent compound.
THERE ARE NO METALS IN A COVALENT COMPOUND !!!!!

20. Nonmetal + Nonmetal Ex. C + O = CO carbon monoxide
COVALENT BONDING
Nonmetal + Nonmetal
Ex. C O
= CO
carbon monoxide

21. Prefixes 1 - 10 Mono - 1 Di - 2 Tri - 3 Tetra - 4 Penta - 5 Hexa - 6
Hepta - 7
Octa - 8
Nona - 9
Deca - 10

22. Using Prefixes
If there is only 1 of the first atom in a compound, you do not add mono
If there is only 1 of the second atom in a compound, you MUST put mono before the name
Always add prefixes to any element name with 2 or more atoms

23. EXAMPLES
P4O10
CO2
SO2
C2H6
CF4

24. Let’s practice!