Complete the table by drawing the models of diatomic molecules and compounds and study the diagrams A to I.

Here are the solutions for the activity.

2.1 Complete the table by drawing the models of the diatomic molecules and compounds.

The key for the elements is:

• Hydrogen: Small empty circle (O)

• Oxygen: Large empty circle (O)

• Nitrogen: Striped circle

• Carbon: Solid black circle (●)

• 2.1.1 H$_2$: Two small empty circles bonded together.

• 2.1.2 O$_2$: Two large empty circles bonded together.

• 2.1.3 N$_2$: Two striped circles bonded together.

• 2.1.4 H$_2$O: One large empty circle (Oxygen) bonded to two small empty circles (Hydrogen).

• 2.1.5 CO$_2$: One solid black circle (Carbon) bonded to two large empty circles (Oxygen).

2.2 Study diagrams A to I below.

• A: Element (Individual identical atoms)
• B: Mixture (Individual small black atoms and diatomic molecules of small empty atoms)
• C: Compound (Identical molecules, each made of one large empty atom and two small empty atoms)
• D: Compound (Identical molecules, each made of one large empty atom and two small black atoms)
• E: Mixture (Molecules from C and molecules from D)
• F: Element (Identical diatomic molecules of small empty atoms)
• G: Element (Identical diatomic molecules of small black atoms)
• H: Mixture (Diatomic molecules of small black atoms and individual small empty atoms)
• I: Mixture (Individual small black atoms, individual small empty atoms, and individual large empty atoms)