Answer:
Rutherford
Explanation:
In 1911, E. Rutherford and his collaborators bombarded a thin gold foil with alpha (positive) particles, coming from a radioactive material, at high speed. The experiment allowed observing the following behavior in the released particles: Most of them passed through the sheet without changing direction, as expected. Some deviated considerably e. A few particles bounced towards the emission source.
In the Rutherford Model the positive charge is concentrated in a central nucleus, so that the positive particles that pass very close to it, deviate enough from their initial trajectory and only those few that collide directly with the nucleus return in the direction of which they come from
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The Rutherford Model states that: The atom has a central zone or nucleus where the total positive charge (that of the protons) and most of the mass of the atom, provided by the protons and neutrons. It also has an outer zone or cortex where electrons are found, which revolve around the nucleus. (Actually, the nucleus particles (protons and neutrons) were discovered after Rutherford established his model. Rutherford's experiment only reported a small, positive nucleus, did not clarify anything else)
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