Assignment: Covalent Bonding

Assignment:
Covalent Bonding

By Joann Peda

Labelling

Match the following

Drag labels to their correct position on the image

chemical formula

molecule

valence electron

chemical bond

covalent bond

​Carbon and Hydrogen

Carbon and hydrogen form the molecule methane, or CH₄.

• The carbon atom satisfies the octet rule because it now has 8 valence electrons.

• Each hydrogen now has 2 valence electrons. Remember that hydrogen is an exception to the octet rule. Hydrogen is stable with 2 valence electrons.

The structural formula for methane substitutes lines for the shared pairs of electrons.

​Oxygen and Iodine

Oxygen can form 2 bonds to create pairs for its 2 lone electrons. The chemical formula of the molecule is OI₂

Both of the models shown are correct Lewis diagrams for this molecule. There are other ways to draw this model, as well.

​Sulfur and Fluorine

Sulfur has 6 valence electrons, so it will form 2 covalent bonds to satisfy the octet rule. The chemical formula of the molecule is SF₂

Both of the models shown are correct Lewis diagrams for this molecule.

Draw

What is the atomic number of Strontium?

Draw

Which equation correctly shows you how to calculate the number of neutrons in an atom?

Draw

Which element has the atomic symbol S?

Use your periodic table.

Draw

Circle aluminum's atomic mass.

Multiple Choice

Look at the image. What do the group numbers, or columns, tell you about each element?

• number of protons

• number of neutrons

• number of valence electrons

• the order they were discovered

Categorize

Options (6)

carbon

silicon

phosphorus

oxygen

chlorine

iodine

Classify each element according to the number of valence electrons the element contains.

Hint: Look at the columns (Groups)

4

5

6

7

Multiple Choice

Which group on the periodic table have 8 valence electrons?

1Points

Image

• alkali metals

• metalloids

• Nobel gases

• Lanthanidea

Draw

Covalent bonds are weak attractive forces that form when atoms share electrons with each other.

Multiple Choice

How many electrons does oxygen need to satisfy the octet rule?

• 3

• 1

• 0

• 2

Multiple Choice

How many electrons does boron need to satisfy the octet rule?

• 5

• 7

• 3

• 4

Labelling

What is missing?

Drag labels to their correct position on the image

7

42

sodium

12

N

1

As

4