CATALYST• Describe a covalent

bond.• Identify the parts of a

covalent compound diagram.

• Draw a stick diagram of a covalent compound.

Name the following ionic compounds:

OBJECTIVESDATE: 02/03/2015

1. Ni2CO3

2. Fe(SO3)2

3. FeBr3

4. K2SO4

Reminders• Polyatomic QUIZ - Monday

Remember…• Ionic bond–Bond formed by the transfer of

electrons–Between a metal and nonmetal

K ClCation Anion

1+ 1-

Covalent Bond• Covalent bond–Bond formed by the sharing of valence

electrons–Between 2 or more nonmetal elements–Atoms will share electrons so that they

obtain 8 electrons in their outermost orbital.

7 valence electrons

7 valence electrons

8 valence electrons 8 valence electrons

Remember Lewis Dots…• Draw Lewis dots for the following

atoms…

O N F H C

6 5 7 1 4

Covalent Compound Diagrams• Diagrams that show how atoms in a

molecule are covalently bonded together• Every line = 2 electrons being shared

Parts of Covalent Compound Diagram

Central Atom

Parts of Covalent Compound Diagram

Single Bond

Parts of Covalent Compound Diagram

Lone Pair

Steps to Drawing DiagramStep 1:

Arrange the atoms into a skeleton structure.a. least electronegative element goes

in the centerb. Hydrogen goes on the outside.c. Carbon goes in the center.

Example 2: AsCl3

As ClClCl

Steps to Drawing DiagramStep 2:

Draw the _______ _____ diagram for each atom.

Lewis dot

Example 3: AsCl3

As ClClCl

Part 2: Steps to Drawing Diagram

Step 3:Draw a line to connect the single electrons between the central atom and the surrounding atoms.a. Each line represents 2 electrons

being shared.

Example 4: AsCl3

As ClClCl

Example 5: AsCl3

As ClClCl

Steps to Drawing DiagramStep 4:

Count to make sure all valence electrons are accounted for in the diagram.

Step 5:Check to make sure all atoms satisfy the octet rule.a. If needed, more than 2 electrons may

be shared between 2 atoms.

As ClClCl

Example 6: AsCl3

8 valence

8 valence

8 valence

8 valence