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 1 and model 3

D.
model 2 and model 4

Answer 1

I can’t see the picture you mentioned. Could you either upload it or briefly describe each model? For each model tell:

- how many circles are shown,
- whether circles are separate or touching/connected,
- whether circles are the same color or different colors.

Quick rule to use: an atom should be shown as a single (unconnected) sphere; a molecule should be shown as two or more atoms (spheres) bonded/connected together. Using that, I’ll pick which two models are correct.