Question

Students created four different models to show the difference between atoms and molecules. The pictures show the four models they created. 

image

Only two of the models are correct. Which models correctly show atoms and molecules?

A.
model 1 and model 3

B.
model 2 and model 4

C.
model 2 and model 3

D.
model 1 and model 4

Answer 1

I can’t see the pictures — could you upload the image or describe each model (what the atoms look like and which are touching or bonded)?

If you prefer to decide yourself, here’s how to tell which models are correct:
- An atom model should show single, unconnected particles (one circle = one atom).
- A molecule model should show two or more atoms chemically bonded (two or more circles touching/connected). Bonds are usually shown by the atoms touching/overlapping or by lines between them.
- Diatomic molecules (like O2, H2, N2) are correctly shown as two identical atoms bonded together.
- A model that shows separate atoms arranged near each other but not touching is not a molecule.

Describe the four models (or upload the picture) and I’ll pick which two are correct.