Atomic models have been improved over the years. Arrange the following atomic models in their chronological order:
$(i)$ Rutherford's atomic model
$(ii)$ Thomson's atomic model
$(iii)$ Bohr's atomic model

On the basis of Thomson's model of an atom,explain how the atom is neutral as a whole.

In the Thomson's model of atom,which of the following statements are correct?
$(i)$ The mass of the atom is assumed to be uniformly distributed over the atom.
$(ii)$ The positive charge is assumed to be uniformly distributed over the atom.
$(iii)$ The electrons are uniformly distributed in the positively charged sphere.
$(iv)$ The electrons attract each other to stabilize the atom.

$(a)$ Write two drawbacks of Rutherford's model of an atom.
$(b)$ State Bohr's postulates to overcome the drawbacks of Rutherford's model.

In the Gold foil experiment of Geiger and Marsden,which paved the way for Rutherford's model of an atom,$\sim 1.00\%$ of the $\alpha$-particles were found to deflect at angles $> 50^o$. If one mole of $\alpha$-particles were bombarded on the gold foil,compute the number of $\alpha$-particles that would deflect at angles less than $50^o$.

State three features of the nuclear model of an atom put forward by Rutherford.