1. Names and Formulas for Ionic Compounds Part 1

2. Types of ions Monatomic ion Polyatomic ion ion with one atom
Mg2+ magnesium ion
Cl- chloride ion
Polyatomic ion
ion with more than one atom
NH4+ ammonium
NO3- nitrate

3. Ionic Compound Marriage
Metals are like men Nonmetals are like woman Typically who changes their last name?

4. Naming Ca”t”ions Monatomic cation name stays the same
Sodium, Na goes to sodium ion, Na+
Calcium, Ca goes to calcium ion, Ca 2+
Polyatomic cation - look up in chart
NH4+ ammonium

5. Naming Anions The name changes in a monatomic anion
The ending for a monatomic anion is ______ide
(like a bride changes her last name)
chlorine, Cl goes to chloride ion, Cl-
Fluorine, F goes to fluoride ion, F-
Polyatomic anion look up in chart
OH- hydroxide
SO42- sulfate

7. Question Time
Given the neutral atom, give the charge and name of the monatomic ion that will form. (Look at periodic table group numbers for help.) Na Cl Mg S P
Na+
sodium cation
Cl-
chloride anion
Mg2+
magnesium cation
S2-
sulfide anion
P3-
phosphide anion

8. Naming ionic compounds
Name the cation first and then the anion second (+ then -)
Example: CsF
Monatomic cations use the element name
Cs+ = cesium ion
Monatomic anions – change the ending to ide
F - = fluoride ion
Name:
cesium fluoride

9. Will these form an Ionic Compound? If so what will the compound name be?
Mg Al
Al S
Mg O
Na N
C S No
two metals
Yes
aluminum sulfide
Yes
magnesium oxide
Yes
sodium nitride No
two non-metals

10. Formula Unit
Formula Unit—the smallest whole number ratio of ions in a compound
NaCl versus Na2Cl2
Correct: Sodium Chloride NaCl
Which is the correct formula unit for sodium chloride?
Why?

11. What will the formula be?
In ionic compounds, we must balance charges to form a neutral compound
To do that, we “crisscross the charges”
Always reduce to get the formula unit
Ca N
Ca2+ +
N3-
Ca3 N2
Both have a total charge of 6 (3 Ca2+ = +6; 2 N3- = -6)

12. Practice
Given the following elements, predict the formula. (hint first identify the ion charge)
K, Br
Ca, Cl
Li, S
Mg, N
Ba, P
K+, Br-
KBr
Ca2+, Cl-
CaCl2
Li+, S2-
Li2S
Mg2+, N3-
Mg3N2
Ba2+, P3-
Ba3P2

13. Names and Formulas for Ionic Compounds Part 2

14. Other Types of ions (page 5)
Polyatomic ion
ion with more than one atom
NH4+ ammonium
NO3- nitrate

15. Naming Ca”t”ions (page 5)
Polyatomic cation - look up in chart
NH4+ ammonium

16. Naming Anions (page 6) Polyatomic anion look up in chart OH- hydroxide
SO42- sulfate

17. Question Time (page 6)
Name of the ion. (Look at the back of periodic table.)
NH4+
OH-
SO3-
SO42-
CN-
ammonium cation
hydroxide anion
sulfite anion
sulfate anion
cyanide anion

19. Ionic Compound Marriage
Metals are like men (potassium) Nonmetals are like woman and sometimes they have children too (chlorite)
K +
ClO2 - =
KClO2 +

20. Naming ionic compounds (not in NT)
Name the cation first and then the anion second (+ then -)
Example 1: NaCN
Monatomic cations use the element name
Na+ = sodium ion
Polyatomic anions – look up
CN - = cyanide
Name:
sodium cyanide

21. Naming ionic compounds (not in NT)
Name the cation first and then the anion second (+ then -)
Example 2: NH4CN
Polyatomic cations-look up
NH4+ = ammonium ion
Polyatomic anions – look up
CN - = cyanide
Name:
ammonium cyanide

22. Formula Unit with Polyatomic ions (middle of page 7)
Sometimes you will need to use more than one polyatomic ion to balance a charge.
If so, you need to put it in parenthesis (like a package) and use a subscript for the multiple number
Ex: Mg2+ and NO3-
These charges do not balance so we must crisscross them
Mg1(NO3)2 (we don’t need the 1)
Mg (NO3)2

23. Practice (do at the bottom of page 7)
Given the following, predict the formula.
(hint first identify the ion charges)
K, BrO3-
Ca, CO32-
Li, SO42-
Mg, NO3-
Ba, PO43-

25. Naming and Formulas: Transition Metals-Part 3

26. Transition Metal Ions Metals form cations
Some transition metals only have one ionic charge
Silver (Ag+), Cadmium (Cd2+), Zinc (Zn2+)
Some transition metals can take on more than one charge.
Copper (Cu+, Cu2+)
Charge is determined from the number of electrons lost
Transition metals form compounds the same way all cations do, which enables us to find the formula units in a similar fashion.

27. Naming Transition Metal Ions
If a transition metal has more than one charge, the charge is written as a Roman numeral in parenthesis
Some metals need a middle name
Fe (iron) has more than one charge: 2+ and 3+
Fe2+ iron(II)
Fe3+ iron(III)
If the transition metal only has one charge, no Roman numeral is needed

28. Naming Ionic Compounds with Transition Metals (not in NT, copy on bottom of page 7)
Given: Fe2O3
First find the charges of the ions
Then name the cation followed by the anion
Iron(III) oxide
Try this one: Fe3P2
the charge on iron is a 2+
iron(II) phosphide
Ions: O2- and Fe3+
What do we call the cation?
What do we call the anion?

29. Question Time(not in NT, copy on bottom of page 7)
Identify the charge on the transition metal:
copper (II) nitrate
gold (I) chromate
Name the compound:
FeO
Zn(OH)2
CoPO4 2+ 1+
iron (II) oxide
zinc hydroxide
cobalt (III) phosphate