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Structure of Atom

Short Answer Type

11. Name a species which has
(i) no electron
(ii) no neutron.

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12.

Do protons and neutrons have identical mass?

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13.

When α-particles are sent through a thin metal foil, most of them go straight through the foil. What inference do you draw from it?

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14.

What did Rutherford's experiment on scattering of particles show for the first time?

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15.
What is Plum-Pudding model of the atom?

J.J Thomson proposed that an atom possesses a spherical shape (radius approximately 10^-10_m)in which the positive charge is uniformly distributed. The electrons are embedded into it in such a manner as to give the most stable electrostatic arrangement. This model is known as Plum-pudding model of the atom.

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