Chemical Reactions Live Class #2

Chemical Reactions Live Class #2

​Making Lewis Dot Structures!

​​A Lewis structure, or a Lewis diagram, is a model that shows the valence electrons surrounding the symbol for an element. Lewis structures are useful models because they help show why and how elements form chemical bonds.

To draw a Lewis model, follow these steps.

1. Write the symbol of the element.

2. Find the number of valence electrons using the group number.

3. Place dots to represent valence electrons. Place 1 dot on each side of the symbol (above, right, below, and left) until no valence electrons remain.

4. If there are more than 4 valence electrons, create pairs with the remaining dots.

Draw

Draw the Lewis Dot Structure for Carbon

Open the periodic table on another tab on your computer to determine the number of

Draw

Draw the Lewis Dot Structure for Sulfur

Open the periodic table on another tab on your computer to determine the number of valence electrons.

Draw

Draw the Lewis Dot Structure for Neon

Open the periodic table on another tab on your computer to determine the number of valence electrons.

​​Follow these steps to use Lewis diagrams to model covalent bonding.

(Sharing of Valence Electrons)

1. Draw Lewis models of each element.

2. Identify the electrons that will pair up to share. Repeat until all electrons are paired.

3. Redraw the model as a full molecule.

Draw

Use Lewis structures to model the covalent bond between Oxygen and Hydrogen

Modeling Ionic Bonds (Stealing/Transfer of Valence Electrons)

Follow the steps below to use Lewis diagrams to model an ionic bond.

• Draw a Lewis structure of each element.

• Draw arrows to show the movement of the electrons.

• Draw the final structures of the ions.

Draw

Use Lewis structures to model the Ionic bond between Sodium and Chlorine