Ionic Lewis Dot Diagrams

How to draw Lewis Dot Diagrams for Ionic Compounds

Lewis Dot Diagrams

The Lewis dot diagram shows the number of valence electrons in an atom in an almost 'box like' fashion around the symbol

Multiple Choice

This could be the dot diagram of

• Mg
• Cl
• C
• O

Multiple Choice

How many dots would you put around carbon, a group 14 element?

• 4

• 6

• 8

• 18

Multiple Choice

How many valence electrons does Aluminum Have?

• 1 Valence electron

• 2 Valence electron

• 3 Valence electron

• 4 Valence electron

• 5 Valence electron

Lewis Dot Diagrams for Ions

Metals lose their valence electrons and form positive ions; cations

Nonmetals gain electrons and form negative ions; anions

Lewis Dot Diagram for Ionic Compounds

Shows the charges on the ions in brackets

Structure of Ionic Compounds

The + and - ions in Ionic compouds are held together by strong 'electrostatic attractions'

The compound will always be electrically neutral

Formation of Ionic Bond

The positive CATION and negative ANION are held together in a crystaline lattice structure

The exact structure and shape will depend on the size of the cation and anion

Formation of Ionic Bond

The formation of an ionic bond is an EXOTHERMIC process which means that energy is released

Multiple Choice

If I gain electrons I become

• Positive because I've added to my atom
• negative because I've added electrons
• same because i'm balanced
• equal because now I have electrons

Multiple Select

The reason that a sodium atom bonds to a chlorine atom is (chose all that apply)

• sodium transfers an electron to chlorine

• the ions are the same size

• the ions have a full outer shell

• oppositely charged ions have a strong electrostatic attraction

• they are happy together

Multiple Choice

Metals tend to 

• gain electrons
• lose electrons

Formation of Ionic Compounds

Metals transfer their electrons to non metals

Formation of Sodium Chloride : NaCl

Formation of Ionic Compounds

For Sodium Oxide : note the number of valence electrons on sodium and oxygen

Oxidation Numbers

The oxidation number indicates the number of electrons lost or gained.

The Metals lose their valence electrons

The Nonmetals gain electrons to get to 8

The group the element is in in the periodic table will tell you how many electrons will be lost or gained.

Multiple Choice

When an ionic compound is formed, its charge is 

• negative
• neutral (no charge)
• positive

Multiple Choice

How do the following two elements bond together?
K¹⁺  S^2- 

• KS
• K₈S
• K₆S₃
• K₂S

Multiple Choice

How do the following two elements bond together?
Al³⁺  O^2-         

• AlO
• Al₂O₃
• Al₃O₆
• Al₃O₂

Multiple Choice

What is the correct formula for the compound, lithium oxide ?

• LiO

• Li₂O

• LiO₂

• Li₂O₂

Multiple Choice

When metals bond with non-metals they form what type of bonds

• covalent
• ionic
• cooperative
• lewis

Multiple Choice

If my charge becomes 2+ what does that say about me?

• I am stealing 2 electrons

• I am losing 2 electrons

• I am in period 2

• I have an atomic # of 2

Multiple Choice

What type of forces hold an ionic compound together?

• covalent bond

• Vander Waals forces

• Metllic bond

• Electrostatic attraction

Multiple Choice

Which of the following diagrams shows an atom that has lost 2 electrons when forming an ionic bond?

Multiple Choice

Which of these diagrams shows an ion for an element from group 15?

Multiple Choice

Which diagram shows an ion that will form from an atom with a neutral electron configuration of 2-8-6?

Multiple Choice

Which diagram shows an ATOM from group 17?

Multiple Choice

Which diagram could be showing an ion of Potassium?

Multiple Choice

Which of the following would be the Lewis Dot Diagram for an ION of Aluminum?