Bonding and Nomenclature

Honors Coordinated Science II

Electron Configurations of Ions

What does an ionic charge mean for the electron configuration of an atom?

Simple Ionic Formulas

Ionic substances typically form a crystal Large group of oppositely charged ions arranged

in a regular pattern. Neutrally charged

Simple Ionic Formulas

To determine the formula of an ionic compound, you need to balance the positive and negative charges.

What is the formula for Calcium Chloride? What is the formula for Calcium Oxide?

http://www.youtube.com/watch?v=QqjcCvzWwww

Ionic Compound Properties

Hard and brittle Solid at room temperature Very High Melting Points Conduct Electricity if heated to liquid state Conduct electricity if dissolved in water or

some other solvent.

Relating Structure to Properties

Each ion is attracted to and bonded with all of its neighbors, so the ions have an interconnecting network of bonds holding the entire crystal together. Makes it hard and difficult to melt. Brittle because putting pressure along edges can

cause the ions to shift place so that positive and negative charges are not aligned.

Writing Names for Ionic Compounds

Binary ionic compounds: First part of the name is just the name of the

element. Second part of the name is a modified version of

the name of the element. Typically, you drop the standard ending and add –ide.

Example: NaF would be ___________________

Warm-up 3/4/11

Write the chemical formula for the following pairs of elements:Strontium and NitrogenSodium and BromineBeryllium and FluorineHydrogen and OxygenBarium and Iodine

Name the compounds you created.

Polyatomic Ions

A small molecule with an overall positive or negative charge.

Writing Names for Ionic Compounds

Polyatomic Ions Sometimes have to use an ion table Otherwise, it is done the same was as it is for

binary compounds. MgCO3 = Magnesium Carbonate

(NH4)SO4 = Ammonium Sulfate

Common Ion Table

Naming with Transition Metals

Some positive ions are followed by Roman Numerals. Describes the charge on that ion.

Most transition metals form multiple charges, as do metals in groups 14 and 15.

How would you write PbCl2?

Warm-up 3/7/11

Name the following compounds: Ag2SO4

Au3N

Fe(NO2)2

Steps to Naming Binary Covalent Compounds

1. Write down the name of the compound as if it were a simple binary ionic compound.

2. Add prefixes to each name which tell you how many of that atom are in the molecule. NOTE: If there is only one

atom of the first element in the molecule you can leave out the “mono” prefix.

Prefix Definitions

Mono = 1

Di = 2

Tri = 3

Tetra = 4

Penta = 5

Hexa = 6

Hepta = 7

Octa = 8

Nona = 9

Deca = 10

Example:

SeBr6

1. Write the name of the compound as if it were a binary ionic compound.Selenium Bromide

2. Add prefixes to indicate the number of atoms for each element. Do NOT add mono to the first element in the compound name.

-Selenium has 1 atom, Bromine has 6 atoms-Prefix for 6 = hexa

Selenium hexabromide

Let’s Practice!

P2S3

H2O

CO

N2O4