1. When we use a scanning probe microscope, do we see atoms directly or do we see them only indirectly? 2. What is the difference between a physical model and a conceptual model? 3. Rank these three...

1. When we use a scanning probe microscope, do we see atoms directly or do we see them only indirectly?

2. What is the difference between a physical model and a conceptual model?

3. Rank these three subatomic particles in order of increasing mass: (a) neutron, (b) proton, (c) electron.