(A) most of the mass of the atom is concentrated in its nucleus. (R) all alpha particles striking a gold sheet are scattered in different directions.A. if both assertion and reason are true and reason is the correct explanation of assertion.B. if both assertion and reason are true but reason is not the correct explanation of assertion.C. if assertion is true but reason is false.D. if both assertion and reason are false.

(A) most of the mass of the atom is concentrated in its nucleus. (R) a

1.	(A) most of the mass of the atom is concentrated in its nucleus. (R) all alpha particles striking a gold sheet are scattered in different directions.A. if both assertion and reason are true and reason is the correct explanation of assertion.B. if both assertion and reason are true but reason is not the correct explanation of assertion.C. if assertion is true but reason is false.D. if both assertion and reason are false.
Answer» Correct Answer - C The results of `alpha`- particle scattering experiment showed that most of the mass of the atom is concentrated in its nucleus. Not all but only high envery `alpha`-particles are scattered when thet strike an extremely thin foil of metal of passing through nucleus.