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 4

B.
model 2 and model 3

C.
model 2 and model 4

D.
model 1 and model 3

Answer 1

I can’t see the picture you attached. Could you either

- paste the four small model images again, or
- describe each model briefly (for each model: how many pieces, whether pieces are touching/connected, and whether pieces are the same or different colors)?

How to tell which models are correct (so you can check quickly):
- An atom should be shown as a single, separate sphere (one ball).
- A molecule should be shown as two or more atoms joined/connected (touching) to form a single unit.
- Different colors usually mean different elements; same color repeated means the same element.

If you describe each model I’ll pick the correct two and explain why.