Which of the Following Is the Best Description of an Atom's

Multiple Choice

Which of the following is the best description of an atom's physical structure?

A) An atom is a solid mass of material.
B) The particles that form an atom are equidistant from each other.
C) Atoms are little bubbles of space with mass concentrated at the center of the bubble.
D) Atoms are little bubbles of space with mass concentrated on the outside surface of the bubble.