Experiment to Scatter Alpha Particles
In 1909 Hans Geiger and Ernest Marsden observed that occasionally alpha particles are deflected through large angles when they strike a thin leaf of gold, even though most had passed through the leaf with little or no deviation. This scattering experiment led to Ernest Rutherford's nuclear theory of atomic structure, which was the first to describe the atom's positive charge as being concentrated in a dense nucleus around which negatively charged electrons circle.
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