Question

What does the small number of rebounding alpha-particles imply about the atom?

Options

• Its mass and positive charge are concentrated in a small volume.

• Its mass is concentrated at the radius of the electron orbit.

• Its mass and positive charge are spread throughout a large volume.

• Its electrons and positive charge are concentrated in the same orbit.

Answer 1

Only a small fraction of alpha-particles encounter conditions that make them rebound. This supports the conclusion that the atom’s mass and positive charge occupy a small volume.