Question

Rutherford alpha particles scattering experiment was responsible discovery of​

Answer 1

Protons – p${}^{+}$

It were the protons which were discovered after the alpha particle scattering experiment. This is because the alpha particles were doubly charged He particles. Rutherford observed that the He particles got deflected in small angles indicating about the presence of positively charged particles [do not forget that + charge repels + charge].

More:-

After the $\alpha$ - particle scattering experiment, the following conclusions were made:-

• Most of the alpha particles passed through the Au foil without getting deflected. This indicated that the atoms have much free space inside them.
• Some particles got deflected from the atoms in small angles. This indicated the presence of positively charged particles.
• 1/12000 alpha particles got deflected by 180°. This indicated that the mass of the atom resides between the atom and there must be a positively charged particle.

Answer 2

Explanation:

Protons – p{}^{+}

+

It were the protons which were discovered after the alpha particle scattering experiment. This is because the alpha particles were doubly charged He particles. Rutherford observed that the He particles got deflected in small angles indicating about the presence of positively charged particles [do not forget that + charge repels + charge].