Ch. 5Ionic Bonding

NamingSection 3

Rules for Naming

Cation_________ charge

Anion_________charge

Compounds_________ charge

Rules for Naming

CationPositive charge

Borrow names

from the names of elements.

Elements that form

2 or more ions

Use Roman

#’s

AnionNegativecharge

Formed from name of element but it ends in -ide.

CompoundsNeutral charge

Made of 2 words cation always named

first

Must combine so that there is

the same (#) of (+)

& (-) charges.

Writing Formulas

Remember:

Cross Over Rule:

The # on the charge of each ion tells you the # of atoms that you

need for the opposite ion.

Simple Ions Polyatomic Ions

Contains Oxygen: Prefixes:

Writing Formulas

Remember:Compounds

must combine so that there is the same # of (+) & (-) charges.

Cross Over Rule:

The # on the charge of each ion tells you the # of atoms that you

need for the opposite ion.

Simple IonsMonatomic –

one atomPolyatomic Ions

Ion made of 2 or more atoms

Can be treated as a single ion charge is not found

atom

Contains Oxygen:* Ends with –ite

or –ate*-ite “less

oxygen”*-ate “more

oxgyen”

Prefixes:*mono – “one”* di – “two”* Thio – “replace oxygen with sulfur”

Need to Know

Binary Ionic Compounds

Binary – indicates that the compound is made up of just two elements

Rules for Naming Ions

Simple CationsBorrow names from names of

elements

Examples K+ → potassium ionZn2+ → zinc ion

Rules for Naming Ions

Elements that form two or more ions

Use Roman #’s

Examples Cu+ → copper (I) ionCu2+ → copper (II) ion

Rules for Naming IonsSimple Anions

Formed from name of element, but it ends in –ide

ExamplesCl- → chloride ionO2- → oxide ionP3- → phosphide ion

Naming Binary Ionic CompoundsThe cation is always named

first

ExamplesNaCl → Sodium ChlorideZnS → Zinc SulfideK2O → Potassium OxideCuCl2 → Copper (II) Chloride

Polyatomic Ions

poly – “many”an ion made of two or more

atoms

can be treated as a single ion charge is not found on a single atom

Polyatomic Ions

EndingsContains oxygenends with –ite or –ate-ite “less oxygen”-ate “more oxygen”

ExamplesNitrate – NO3

-

Nitrite – NO2-

Polyatomic Ions

Prefixesmono – “one”di – “two”thio – “replace oxygen with

sulfur”Examples

monohydrogen phosphate HPO42-

dihydrogen phosphate H2PO42-

Ch. 5Ionic Bonding

Practice Section 5.3

PracticeWrite the names for the following:

1. N3-

2. Fe3+

3. Mg2+

4. Ca3N2

5. FeI3

6. Na2O7. AlCl3

8. SrO9. CuCl2

10.Al2S3

PracticeWrite the formulas for the following:

1. Copper (II) oxide2. Sodium fluoride3. Zinc chloride4. Aluminum sulfide5. Potassium nitride

Practice Write the formula for he following:

1.Aluminum nitrate

2.Ammonium phosphate

3.Ammonium acetate

4.Potassium permanganate

Write the name for the following:

5.Ca(NO3)2

6.CuSO4

7.CuNO3

8.Na2CO3

9.K2Cr2O7

Homework

Section Review 5.3

#’s 5 - 8