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

On the basis of Rutherford's model of an atom, which subatomic particle is present in the nucleus of an atom?

Which sub-atomic particle was discovered by

(a) Thomson

(b) Goldstein

(c) Chadwick.

(a) Which metal did Rutherford select for his α-particle scattering experiment and why ?

(b) What do you think would be the observation of α-particle scattering experiment if carried out on

(i) heavy nucleus like platinum

(ii) light nuclei like lithium.