Question

Which of the followings was not explained by J. J. Thomson's atomic model?

• A. Stability of an atom.
• B. Scattering of $\alpha -$ particles by thin foils.
• C. Co-existence of positive and negative charges in an atom.
• D. All of the above

Answer 1

The correct option is D All of the above

Thomson failed to explain stability of his atomic model and co-existence of positive and negative charges in proximity, within an atom. His model of the atom also failed to explain $\alpha -$particle scattering.
The observations of $\alpha -$particle scattering experiment point towards the presence of large empty space within an atom and concentration of positive charges at the centre.

Hence, $\left(D\right)$ is the correct answer.