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A few alpha particles bounce off a thin sheet of gold foil. what did scientists infer about atoms from this experimental result

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Answer is: scientists infe nucleus in atom.
This was famous Rutherford's Gold Foil Experiment: he bombarded thin foil of gold with positive alpha particles. Rutherford observed the deflection of alpha particles on the photographic film
Alpha particles are helium atom particles, consist of two protons and two neutrons. 

Answer:

atoms have a dense, positively charged center.

confirmed by apexxxx

Explanation:

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