Question

which of the following particle diagrams is the best model for a sample of pure chlorine gas? (each circle of a different shade or size represents an atom of a different element.)

Explanation:

Chlorine gas (\(Cl_2\)) is a diatomic molecule. In a pure sample of chlorine gas, all the molecules should be identical.

• Option A shows two different types of particles (one type of diatomic molecules and one type of mono - atomic or different - sized particles), so it is not a pure sample.
• Option B shows a mixture of different types of particles (some diatomic and some mono - atomic), so it is not a pure sample.
• Option C shows two types of particles (different diatomic molecules), so it is not a pure sample.
• Option D shows only one type of diatomic molecules, which is consistent with a pure sample of chlorine gas (\(Cl_2\)).

Answer:

D