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Difficulty: EasyAtomic Models

During Rutherford's alpha particle scattering experiment, the vast majority of alpha particles passed straight through the gold foil with little to no deflection. What conclusion about atomic structure was drawn directly from this specific observation?

  1. The atom consists mostly of empty spaceAnswer
  2. B
    The positive charge is uniformly distributed throughout the atom like a sphere
  3. C
    Electrons orbit the nucleus in fixed, quantized energy levels
  4. D
    Alpha particles are absorbed by electrons, causing them to jump to higher energy states

Answer

The atom consists mostly of empty space
In Rutherford's alpha particle scattering experiment, the fact that over 99% of alpha particles passed straight through the foil undeflected indicates that they encountered no massive positive obstacle. This directly proved that the volume of an atom consists predominantly of empty space, with positive charge concentrated in a tiny central region called the nucleus.

Step-by-Step Solution

1
Analyze the experimental observation from Rutherford's experiment
The vast majority of positively charged alpha particles suffered no deflection when passing through gold foil.
Deflection occurs when alpha particles pass close to a dense positive charge.
2
Deduce the physical implication for the structure of the atom
Since almost no deflection occurred for most particles, they encountered no heavy concentration of positive charge or mass in their path.
This proves that the dense positively charged nucleus occupies an extremely small fraction of the total atomic volume, leaving the rest as empty space.

Key Concept

Rutherford's Alpha Scattering Experiment and Nuclear Atom Model
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Topics

Atomic Models

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