1. Chapter 9 Chemical Names and Formulas 9.1 Naming Ions
9.2 Naming and Writing Formulas for
Ionic Compounds
9.3 Naming and Writing Formulas for
Molecular Compounds
9.4 Naming and Writing Formulas for
Acids and Bases
9.5 The Laws Governing How
Compounds Form
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2. Naming Ions Monoatomic ion – one atom with charge
Ion – atom with charge
cation- metals, location: left of periodic table, positive charge
anion – nonmetals, right of table, negative charge

3. Predicting Ionic Charges
Group 1A:
Lose 1 electron to form 1+ ions
H1+
Li1+
Na1+
K1+
Rb1+
Please point to other groups to have students recall valence electrons and determine the charge of the elements in each column.

4. Predicting Ionic Charges
The charge is sometimes referred to as the oxidation number or oxidation state

5. Chemical names and Formulas
There are three types of ionic compounds to write formulas for and name
Binary ionic compound
Transition metal compound
Ionic compound containing polyatomic ions
Covalent compounds have a different naming system
It uses prefixes
Acids

6. Chemical names and Formulas
Binary ionic compounds are made up of only 2 different elements
There can be more than 2 or more atoms though
NaCl
K2O
Al2S3

7. To name a binary ionic compound
Write the name of the cation first (always a metal)
Write the name of the anion, but change the ending to –ide
Note that any subscripts do not change the name
NaCl
sodium
chlorine → chloride
sodium chloride

8. Chemical Naming K2O Al2S3 Please do together as a class.
Potassium oxide.
Aluminum sulfide

9. Name the following compounds
Worksheet
Name the following compounds KI
MgO
SrS
BeF2
Li2O
Al2O3
Cs3N
Ba3P2
Have students name compounds in their notebooks.

10. Writing Chemical Formulas
To write formulas it is important to remember that the charges on the compound must be balanced
Same total number of positive and negative charges
Determine if the charges are balanced
NaCl
LiO KI
BeBr
NaBr

11. When charges are not balanced, it is necessary to add subscripts
They represent the quantity of each element
No subscript equals 1 atom
Li+O2- the charges are not equal
There is only one positive and two negatives
We need another positive charge to make them equal
Li2O

12. Write formulas for the following compounds
Sodium sulfide
Potassium iodide
Calcium bromide
Aluminum oxide
Boron bromide
Rubidium selenide
Have students write formulas in notebook.

13. Writing Formulas for transition metals
Sometimes the metal in a compound is a transition metal
Transition metals can have various oxidation numbers or charges
For example iron can be either Fe2+ or Fe3+
Transition metals can move their electrons from the s to the d orbitals.
This gives them various oxidation numbers or charges.

18. Polyatomic ions are ions that contain more than one atom
(SO4)2-
(OH)-
(PO4)3-
(NH4)+
It is important to note that the charge is distributed throughout all the atoms in the ion
Not only on the last atom