4.3 The Mass of an Atom Is Concentrated in its Nucleus

The Discovery of the Atomic Nucleus

The gold foil experiment reveals that most of the mass of each atom is concentrated in a tiny center known as the atomic nucleus. Duration: 5:32.

Atoms Are Spacious

The atomic nucleus is shown to scale, as are the electrons. The result is that the atom is made of mostly empty space. The implications of this thought are explored. Duration: 4:26