Question

rutherford's atomic model​

Answer 1

Explanation:

Ernest Rutherford designed this experiment to know the arrangements of electrons in an atom. In this experiment fast moving alpha particles were made to fall on a thin gold foil

He selected a gold foil because he wanted a thin athin layer as possible

Answer 2

Answer :

Rutherford's Atomic Model -

• Rutherford proposed the nuclear atom of model after alpha particle scattering experiment.
• In this experiment, energetic alpha particles from a radioactive source was directed at a thin foil of gold.
• Around the gold foil, a fluorescent zinc sulphide screen was placed, to observe the the position of particles after striking this screen.
• Rutherford predicted that the particles would slow down and change directions by small angles as they pass through the gold foil.
• The results were different from what Rutherford predicted.
• The results of alpha particle scattering experiments are :

1. Most of the alpha particles pass through the gold foil undeflected.
2. Some of the alpha particles deflected by small angles.
3. Very few alpha particles bounced back and deflected by large angle nearly 180 degree.

• Rutherford concluded that :

1. Most of the space in the atom is empty because alpha particles passed through the foil undeflected.
2. There is a small volume of positive charge inside the atom because of which alpha particles scattered by small angles.
3. The volume occupied by the nucleus is is very small because of which only few particles scattered by large angles.

• These observations made through the results ofof the alpha particle scattering experiment helped Rutherford to propose nuclear model of atom.

According to him :

1. The positively charged nucleus is densely concentrated at a very small volume.
2. The nucleus is surrounded by electrons which move around it in in circular path is called orbits.
3. The electrons and nucleus are held together by electrostatic forces of attraction.