Describe briefly Thomson model of an atom.

How is position of electron and proton in an atom established? Describe an experiment in this regard.
Or
Describe Rutherford's scattering experiment. How did it lead to Rutherford’s nuclear model of atom?
Or
Describe an experiment which provides evidence that most of the charge and mass of an atom is concentrated in its nucleus.

How will you explain the observations of Rutherford's α-ray scattering experiment?

Discuss the drawbacks or limitations of Rutherford model of atom.

How was neutron discovered? Describe briefly.

What are atomic number and mass number? How are they related to each other?

Calculate the mass and charge of one mole of electrons.