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the results of ernest rutherford's alpha particle scattering experiments proved that the mass of the atom was (1) its centre, and that

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The results of Ernest Rutherford's ALPHA particle scattering experiments proved that the MASS of the atom was (1) its CENTRE, and that this mass was ... (2)... . 1: concentrated at; 2:negatively charged 1: concentrated at; 2:positively charged 1: dispersed persed around; 2: negatively charged 1: dispersed around; 2: positively charged

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Harriet Advanced · Tutor for 1 years

Answer

### 1: concentrated at; 2: positively charged

Explanation

## Step1: Rutherford's Experiment### Rutherford conducted an experiment where he bombarded thin gold foil with alpha particles. He expected the particles to pass through with minimal deflection if the mass was evenly spread throughout the atom.## Step2: Observation of Deflection### Contrary to expectations, some alpha particles deflected at large angles, and a few even rebounded, indicating a dense and massive center.## Step3: Conclusion on Atomic Structure### This observation led Rutherford to conclude that the mass of the atom is concentrated in a small, dense nucleus at the center of the atom.## Step4: Charge of the Nucleus### The deflection of positively charged alpha particles suggested that the nucleus itself is positively charged.