1. Homework Assignment: In Text
page 180 1,2
Page 183 3, 8
Page , 14
Page
Needs 37 min or so

2. Homework Review
Study guide – Concept Review page 33 and 34. The support reading is page in the text.

3. Today: Chem talk
We will learn about the different kinds of ions
How to name ions for use in compound naming.

4. The Different Kinds of Ions
1. Monatomic Ions---Ions having only one atom
Two kinds: Positive or negative
a. only one charge-ex: Na+, Ca2+
Cl-1, O-2
b. more than one charge
ex: Fe2+, Fe3+
2. Polyatomic Ions---Ions made of more than one atom, also positive or negative.

5. Let’s start with monatomic Ions—ions consisting of one atom.
Rules:
1. metallic elements tend to lose electrons
2. nonmetals tend to gain electrons
Many form ions with only one charge. (Note: group 14 and group 18 generally do not form ions)
For simple ions, there are two ways to name:
Positive ions—use their elemental name. So a Na+1 is called a sodium ion. Zn2+ is called a zinc ion.
Negative ions have the name of the element with end changed to end in “ide”. Example: Cl-1 is called a chloride ion.
P-3 is called a phosphide ion

6. Some, however, can form more than one ion.
Go in the reference table to iron.
iron can form a 2+ or 3+ ion.
How would you know which one to use?
copper can form a 1+ or 2+
We need an additional way to tell you which one it is because you have no way of knowing.

7. Iron(III) is Fe3+ Lead(IV) is Pb4+ Cobalt(II) is Co 2+
To eliminate confusion, a simple system was created to name the ion. It is called the Stock system and it uses Roman Numerals to tell you what the ion charge is.
Rule 1: If a plus ion forms only one charge—no roman numeral.
Rule 2: If a plus ion forms more than one charge—a roman numeral is given indicating the charge.
Roman numerals: I = 1, II = 2, III = 3, IV = 4, V = 5
When written, the roman numeral is placed in a parenthesis.
you must be told because there is no other way to know!!
Examples:
Iron(III) is Fe3+ Lead(IV) is Pb4+ Cobalt(II) is Co 2+

8. For Regents Chemistry, where are the ions found?
Ions that form only one charge number.
Group 1, group 2, group 13, group 16, group 17—look for the number in the upper right corner.
Group 15 is usually minus 3.
Ions that form more than one charge number.
There are eight: Cu, Fe, Hg, Pb, Sn, Cr, Mn, and Co
They are mostly transition metals.

9. What is my name?
Cu2+
Copper(II)
Lead(II)
Pb2+
Fe3+
Iron(III)

10. Polyatomic Ions
Polyatomic Ions are groups of atoms that carry a set charge, but behave as a single ion.
For regents chemistry, they are covalently bonded atoms that hold a charge—either positive or negative.
They act as a single unit.
Most are negative but three are positive.

11. A table of common polyatomic ions
Let’s look at some.
A table of common polyatomic ions

12. They all have names as found in the reference table, page 1.
What is my name?
Ca2+
Fe2+
SO4-2
MnO4-
NH4+
Calcium ion
Iron(II) ion
Sulfate ion
Permanganate ion
Ammonium ion

13. End